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Nothing unusual will happen on the battlefield: the number of spirits will increase by 2 (32769), but after the battle, it will become negative (-32767). You can separate individual units from the "negative" troops, so we separate two units and get two squads of ghosts: 2 and 32767. You just need to kill the peasants and not worry about it.
P.S. The number of warriors in a squad on the battlefield ranges from 0 to 65535 (WORD). The game interprets this number as an unsigned number. And in the information window, the squad size is interpreted as a signed number (from -32768 to 32767). That is, 32767 + 1 = 32768 (unsigned) = -32768 (signed). Next, -32768 + 1 = -32767. When we separate individual units, a subtraction is performed: -32767 - 1 = -32768, -32768 - 1 = 32767.