In melee, who plays Ambush first, and what else may be played before it resolves?

Question

Accepted Answer

The inactive player plays all Ambush cards first, then the active player plays his, and the melee is fought at each side's current firepower. Only Ambush may be played before melee resolves, but Wire and Mines may be placed on incoming units, even your own.

Combat Commander: Europe

In melee, who plays Ambush first, and what else may be played before it resolves?