**Topic:**For The People Material

**Amphibious Assault vs Forts**

I would reference folks back to my msg 6732 where I laid out the designer intent and analysis behind these interactions. From a pratical point of view I went back and made a matrix of all possible situations just to make sure that I had it right. I will include that here, so the details are evident and then the broader way to easily rule on this should become evident.

There are two basic cases, ungarrisoned fort and garrisioned fort. With three exceptions, the outcome doesn't change whether there are 1, 2 or 3 Union SP. The results are written result versus attacker/ defender.

Ungarrisoned Fort

1-0: In this case the Amphibious invasion fails because the fort wins the battle under rule 7.32, and the Union loses 1sp.

0-1: In this case the Amphibious invasion wins, due to 7.32, the Union SP survives and remains in the fort space.

0-0: In this case the Amphibious invasion wins, due to rule 6.81, where the Amphibious invasion wins ties and has a surviving SP.

1-1: This is a case for ungarrisoned forts, where the number of invading SPs makes a difference in the outcome. If there is only 1 Union SP the Amphibious invasion fails, due to rule 7.32, and 6.81 does not apply since there are no surviving SP. If there are 2 or more Union SP, then the Amphibious invasion suceeds due to 6.81 since there is a surviving Union SP.

1-1*: If there is 1 Union SP, the invasion fails, because 7.34 does not apply, but 7.33 does, since there is a surviving defending zero SP. If there is 2 or more Union SP, the Amphibious invasion suceeds due to 7.32. The asterisk breaks the tie in favor of the attacker and there are surviving Union SP.

2-Any: This result is rare, but the Amphibious invasion fails due to 7.32.

Garrisoned Fort

1-0: The Amphibious invasion fails, due to 7.32.

0-1: The Amphibious invasion suceeds due to 7.32.

0-0: The Amphibious invasion fails due to 7.32.

1-1: The Amphibious invasion fails due to 7.32. Rule 7.34 does not apply because the defender is not eliminated due to the zero SP fort.

1-1*: This is the one case for garrisoned forts where the number of Union SP changes the outcome. If there is 1 Union SP, the invasion fails, because 7.34 does not apply, but 7.33 does, since there is a surviving defending zero SP. If there is 2 or more Union SP, the Amphibious invasion suceeds due to 7.32. The asterisk breaks the tie in favor of the attacker and there are surviving Union SP.

2-Any: The Amphibious invasion fails due to 7.32.

Broad Rules of Thumb

Having written this all out, there is no case where 1 Union SP can capture the fort (garrisoned or ungarrisioned) if it is eliminated. In the ungarrisioned fort case 1 Union SP can only win if it survives because the fort rolled a zero attrition result (only possible if the fort modifier is totally neutralized). The only times that having two or more Union SP changes the results is versus an ungarrisioned fort in a tie battle outcome (0-0 or 1-1) OR a 1/1* result AND a garrisioned fort where an asterisk result occurs, as in any normal battle. The first of these two differences is an important one since a 1-1 result is a common outcome in 2SP versus ungarrisioned fort battles.

I hope this clarifies and unknots this issue. I do not believe I have ever ruled differently, but this analysis covers all cases and is internally consistent.

The one extra point that I will add is the way in which 6.42 supercedes 7.33. This has unique situation and has no bearing on any of the fort cases. It applies specifically to when you invade a non-fort space that is defended by 1 CSA SP versus 2 or more Union SP. If the CSA wins the battle, but the CSA SP is eliminated, the surviving Union SPs retreat instead of taking the space ala 7.33, because 6.42 whereby an Amphibious invasion that loses is retreated, takes precedence over the fact that there are surviving Union SPs in the now vacant space.

I hope that covers the waterfront. Let me know,

Take care, Mark

**Some additional thoughts...**

I wanted to write a seperate addendum to the above case analysis that brings probability into the game. Some of the cases are not possible, but I included them to show the internal logic of the rules and for completeness.

Ungarrisioned Fort The only result that can usually occur is either a 1/1, 1/1*, or a 0-1. The 0-0 and the 1-0 cannot occur because any force versus an ungarrisioned fort gets a +4 modifier. Consequently, if the fort is not neutralized a single SP cannot win. If the fort is neutralized there is a 1 in 6 chance of a single SP taking a fort. If the Union has 2 or more SP then it always wins.

Garrisoned Fort There are a variety of situations here because there are many situations where the defender can have more than 1SP defending. Because of this all of the cases above become probable in some circumstances.

I hope that adds to folks understanding of these situations when they crop up in the game.

Mark