Be warned: boards at this point are beginning to get so difficult, that they really aren't fun anymore. Expect to lose often, and expect to win only by maximizing the very smallest advantages.
Board 25
Send a Mule with Charlie to the south factory as quickly as you can, and bring the reinforcements north to join the rest of your forces.
Board 26
Forget about taking any factories. Axis will claim them all in two turns. Huddle near your Prison Camp and make frequent repairs on you units.
Board 27
Mobilize your Charlie and take the factory to the North. Leave bigger, slower units behind to pick off enemy units. Take strategic advantage of your trigger to increase defensive maneuvers. Even if you capture the rest of the board, the choke point to the enemy prison could lose you the game.