critters ate my broccoli seedlings

Last Thursday, I planted 12 little broccoli seedlings. Saturday morning I checked on them and some critter had eaten the tops off of 3 or 4 of them. I think it was probably chipmunks (too early for baby rabbits and cutworms don't eat off just the leaves). My solutions was to replant my extra seedlings and cover the plot with hoops and row cover. I hope this works. I haven't had this problem before.