One map square of trees holds 4 trees. It takes 2 trees to build a road or wall. It takes 20 trees to build a boat. It takes 20 seconds to completely refuel a tank with no armor, shells or mines. Shooting from a boat, you can only hit land one square from the shore.
Trees leave grass when plucked.
Hence, it takes 18 shots to destroy a fully-armored base. Trees grow first next to existing trees, then in decreasing order, on grass, rubble, crater, swamp, road. When a builder is killed, the man comes back to where his tank was when he died, not to where the man died. Refuelling bases replenish one unit per player in the game every twenty seconds. Speed of a bullet is 32 World units per tick.