Slitherine

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2.4.1 When to check supply
Units at sea are always in supply.

8.2.4 Naval search numbers
The weather can affect the chances of finding and surprising naval forces at sea. It does this by altering the search numbers in each sea-box section during port attacks (see 11.2 Port attack), naval searches (see 11.5.5 Searching) and interceptions (see 11.4.6 Interception).

11.4 Naval movement
The range determines how far the unit can move; the movement allowance determines how effective it will be when it patrols a sea area.

Into and out of port
When you move a unit out of a port, you must spend its first point to move it into a surrounding sea area (e.g. naval units in Amsterdam must move directly into the North Sea).

There are three special cases:
Although Kiel is a coastal hex on the Baltic Sea, you can move naval units directly to Kiel from the North Sea and vice versa.

Although Suez is a coastal hex on the Red Sea, you can move naval units directly to Suez from the Eastern Mediterranean and vice
versa.

Although Panama City is a coastal hex on the Gulf of Mexico, you can move naval units directly to Panama from the Caribbean, and vice versa provided the Panama canal is not closed to you.

Similarly, a naval unit can only move into a port from the surrounding sea area. It could continue moving but, if it ends the naval move in port, turn it face-down (for convoy points, use a “CP used” marker instead).

Sea areas
When a moving unit or task force enters a sea area, it can either stop there and patrol or, if it has enough movement points and range, it can continue moving into an adjacent port or an adjacent sea area.

How far can units move?
A unit must stop moving when you have spent its entire movement allowance or it has reached the limit of its range, whichever happens first.

You spend 1 point of a unit’s range for each sea area and port it moves into.

You spend 1 point of a unit’s movement allowance:
For each sea area and port it moves into;
If it starts the movement out of supply;
If it starts the impulse in a port with naval units controlled by another major power; and
For each point of the (unmodified) search number of the section you put the unit into.

How does a unit patrol?
When a naval unit stops in a sea area, it is patrolling. To show this, you must put it into that area’s sea-box. You can put it in any section of the sea-box which has a (unmodified) search number less than or equal to the unit’s unused movement allowance. [This is different from the system used for naval air missions.]
A unit can only be in one section of a sea-box at a time. Other units could be in the same or different sections of the sea-box.

Convoy points can only ‘patrol’ in the 0 section of the sea-box, even if they have unused movement points.

If a unit started its naval move out of supply (see 2.4.2 Tracing supply), turn it facedown when it reaches a sea-box section.

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Or you can read How far can units move? this way.

A unit must stop moving when you have spent its entire movement allowance or it has reached the limit of its range, whichever happens first.

When a naval unit moves to sea and:
Is out of supply it spends 1 point of its movement allowance (units at sea are always in supply).
Starts an impulse in a port with naval units controlled by another major power it spends 1 point of its movement allowance.

A naval unit spends 1 point of its range and 1 point of its movement allowance when it moves:
"From a port to a sea area"
"From a sea area to a port"
"From a sea area to a different sea area"

When a naval unit stops in a sea zone to be placed in sea box:
Zero it spends zero points of its movement allowance.
1 it must spend 1 point of its movement allowance.
2 it must spend 2 points of its movement allowance.
3 it must spend 3 points of its movement allowance.
4 it must spend 4 points of its movement allowance.

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Sea Zone: South China Sea
Sea box Zero ~ No Shore bombardment is allowed
Sea box 1 ~ shore bombardment modifier 2*
Sea box 2 ~ shore bombardment modifier 1*
Sea box 3 ~ shore bombardment modifier 0*
Sea box 4 ~ shore bombardment modifier 0

If the weather is rain the asterisk means you add 1 to the shore bombardment modifier.

11.16.2 Shore bombardment
Shore bombarding SCS add their bombardment factors to an attack. Reduce the bombardment factor of each SCS by the bombardment modifier in its section of the sea-box (see weather effects on bombardment ~ 8.2.7 Land combat). You can’t bombard with SCS in the ‘0’ section (note the ‘none’ there).

Shore bombardment
Add 1 to a sea-box’s asterisked shore bombardment (see 11.16.2 Shore bombardment) modifiers for units in that sea-box bombarding a hex in rain or snow. For example, if the modifier is ‘0*’, treat it as a ‘1’ for units bombarding a hex in rain.

Your units cannot shore bombard a hex in storm or blizzard.

8.2.6 Invasions
You can’t invade (see 11.14 Invasions) a hex in storm, snow or blizzard.

11.14 Invasions
Invasion combats
The notional unit has 1 combat factor, modified by:
+1 if it is a city hex;
+1 if the hex is in the home country of the major power that controls the hex;
+1 if it is not stacked with a land unit, but is in the ZOC of a friendly corps or army;
+ The shore bombardment modifier for each invading unit;
-1 if it cannot trace a basic supply path of any length;
-1 if surprised (see 15.Surprise).

The shore bombardment modifier applies to each unit that invades. Use the modifier from the section of the sea-box the unit invades from (remembering the effect of weather ~ see 8.2.7 Land combat).

These modifications are cumulative but the notional unit can never have less than 0 combat factors.

The notional unit is treated like a normal unit for all purposes during combat except that they only have a ZoC into their own hex and are always face-down.

Invading MAR units have their normal combat factors. Halve the combat factors of other invading units.

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If the weather is fair:
Light cruiser HMAS Adelaide in sea box 2 has a shore bombardment value of zero.
Light cruiser HMAS Adelaide: 1 (Shore Bombardment Factor) - 1 (Sea box 2 bombardment modifier) = zero

0.5 CW land combat factors + zero shore bombardment factors = 0.5 CW land combat factor

The Vichy French notional unit has a value of 1.
1 notional unit combat factor + zero for the shore bombardment modifier for the invading unit - 1 for surprise = zero

The odds are 0.5 (CW land combat factors) to zero (Vichy French notional unit value).

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If the weather is rain:
Light cruiser HMAS Adelaide in sea box 2 has a shore bombardment value of zero.
Light cruiser HMAS Adelaide: 1 (Shore Bombardment Factor) - 2 (Sea box 2 bombardment modifier) = zero

0.5 CW land combat factors + zero shore bombardment factors = 0.5 CW land combat factor

The Vichy French notional unit has a value of 1.
1 notional unit value + 1 the shore bombardment modifier for the invading unit - 1 for surprise = 1

The odds are 0.5 (CW land combat factors) to 1 (Vichy French notional unit value) or 1 to 2.

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Sea Zone: South China Sea
Sea box Zero ~ No Shore bombardment is allowed
Sea box 1 ~ shore bombardment modifier 2*
Sea box 2 ~ shore bombardment modifier 1*
Sea box 3 ~ shore bombardment modifier 0*
Sea box 4 ~ shore bombardment modifier 0

If the weather is rain the asterisk means you add 1 to the shore bombardment modifier.

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If the weather is fair:
Heavy cruiser HMAS Australia in sea box 3 has a shore bombardment value of 1.

Since the shore bombardment factor cannot exceed the land combat factor the shore bombardment factor is reduced to 0.5.

0.5 CW land combat factors + 0.5 shore bombardment factors = 1 CW land combat factor

The Vichy French notional unit has a value of 1.
1 notional unit combat factor + 1 for the shore bombardment modifier for the invading unit - 1 for surprise = 1

The odds are 1 (CW land combat factor) to 1 (Vichy French notional unit value).

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If the weather is rain:
Heavy cruiser HMAS Australia in sea box 3 has a shore bombardment value of zero.

0.5 CW land combat factors + zero shore bombardment factors = 0.5 CW land combat factor

The Vichy French notional unit has a value of 2.
1 notional unit value + 2 the shore bombardment modifier for the invading unit - 1 for surprise = 2

The odds are 0.5 (CW land combat factor) to 2 (Vichy French notional unit value) or 1 to 4.

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Odds ratios
Compare the attacker’s total to the defender’s total and work out the basic ratio between them. Round the ratio to a whole number. Always round in favour of the defender. For example, 19:5 rounds to 3:1, not 4:1.

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11.14 Invasions
At the end of the attack declaration step (see 11.16 Land combat), you can state that your notional unit is to be ignored [you might do this to prevent breakthroughs by units attacking in conjunction with an invasion]. If you do (and there are no other friendly land units in the hex), there is no attack, and the attacker occupies the hex as if debarking onto a friendly hex (see 11.13 Debarking land units).

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ORIGINAL: Extraneous

We always evoked this rule if the defender had zero combat factors.

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11.14 Invasions
At the end of the attack declaration step (see 11.16 Land combat), you can state that your notional unit is to be ignored [you might do this to prevent breakthroughs by units attacking in conjunction with an invasion]. If you do (and there are no other friendly land units in the hex), there is no attack, and the attacker occupies the hex as if debarking onto a friendly hex (see 11.13 Debarking land units).