In some circumstances, deployment effects may not trigger, and this may be within game rules and as per intended game mechanics. Most notably, the bomber PETLYAKOV Pe-2FT and the countermeasures EVASIVE ACTION and CLOSE CALL can affect deployment effects.
The PETLYAKOV Pe-2FT’s special effect is that, while this unit is on the board, deployment effects do not trigger.
If a PETLYAKOV Pe-2FT is on the battlefield, then no deployment effects will trigger - neither yours, nor the opponent’s. If your deployment effects didn’t trigger, then review the battlefield to see if there’s a PETLYAKOV on the board.
EVASIVE ACTION is a British countermeasure that costs 0 kredits to play. When activated, this card triggers when the enemy deploys a unit with a deployment effect, and cancels the effect.
CLOSE CALL is a British countermeasure that costs 2 kredits to play. When activated, this card counters an order or deployment effect that targets a friendly unit.