+0     WORD    Number of battles this turn
 +2   n RECORDs of variable length, for each battle:
                 +0     WORD    X
                 +2     WORD    Y
                 +4     WORD    Number of surviving ships
                 +6   n WORDs   Id numbers of surviving ships
                 +?     WORD    Number of killed ships
                 +?   n WORDs   Id numbers of killed ships