How did the Gladers prepare for the first evening in this changed world?

The Glade is a chaotic scene. Keepers order the others about. Flashlights are distributed. Nonperishable food is moved to the Homestead. Minho carries weapons out of the basement. The Homestead is to become their fortress. Tonight they just have to hold the Grievers off, tomorrow they can explore the Maze and find a way to get out or barricade the Griever Hole.