Using V 1.04b - 1775 scenario as British.
Do nothing with the Boston army on turn 1. On turn 2 when the large British army arrives at Boston, combine both armies and attack the American army under Ward sitting outside Boston.
You will win the battle. The combat report shows 572 attacker points vs 0 defender points, yet the casualties are 58 attacker and 129 defender. The American commander is Joseph Warren , with Israel Putnam the only American present; no American combat units are present (all the British units do show). Yet the combat loss section at the bottom shows 3 American militia killed.
The American army units should have been shown as present in the combat screen
When I mouse over the American army at the start of the next turn, I see many casualties, proving that they fought and lost a large battle.
Repeatable several times in a row.