I defended the garage for about 20 turns, though I did do some stupid things that caused me to lose. Like wasting heroics on a few people. But yeah the garage is doable. I have most of the people at the south exit to hold off the zombies there, and then I have the girl with the bow and arrows at the entrance from the inside of the house to hold off the zombies that come in through the house. I probably could have put a second person there but she was holding them off fine by herself.