Great mission. Finish it with doubled AI units.
The church was the most difficult part, where reinforcements from the defense came too quickly, and my tank was out of ammo at that time. Some of the defense AI troop hided in the north room of the church, where in the capture point range but can't be seen by attack AI troop, that cause the stalemate.
After that, my strategy had to be driving my new tank to rush the capture points one by one, and try to capture it before the defense troops respawn.