My team (myself and two of my best friends) was under heavy assault by the computer on a map with a long river and only 3 crossings (I believe it was the highlands map). We were outnumbered, and the computer had us beat resources-wise. But we each managed to plug a hole with a very small squad of powerful units (in my case the Mongol unique unit, the Mangudai), we held back wave after massive wave of enemies, only occasionally able to reinforce our troops. after what seemed like hours of constant assault the fight stopped, and when the smoke cleared the battlefield was littered with enemy corpses, and only a few of our men were dead. Few had stood against many and we held them back until they could fight no more, we had won the day.