If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Commander, allies are coming and enemy is fleeing! Now is our time, destroy them! Prepare for ambush!
Deploy your units near the road. When enemy is in range, choose when to give the fire command. Be careful, enemy will return fire and your troops may be killed. Do not worry, allied airplanes are here to help.