In rare cases, an alliance of necessity might be formed between two forces that are openly hostile to one another. They might not be warring at present, but they certainly have been in the past and, once the current threat is dealt with, could quickly start warring again.
An allied contingent that is noted as being Suspicious follows all the rules given previously for an Uneasy allied contingent. In addition:
Should a unit belonging to a Suspicious allied contingent flee through a unit belonging to the main army, or vice versa, it must make Peril tests, exactly as if it had fled through an enemy unit.
Units belonging to a Suspicious allied contingent suffer a -1 modifier to their Leadership characteristic whilst within 6" of a unit belonging to the main army, and vice versa.