This image from the Northern Gateway's interior detail shows two important events preceding the Buddha's enlightenment--Sujata's offering and temptation by Mara. The Buddha is represented by the tree on the left), Sujata is the small figure holding a pot just below it, and in the center and right are Mara and his vanquished demon hosts. According to tradition, Sujata gave the Future Buddha a plate of rice cooked in milk (she had vowed to offer it to the spirit of a tree, and mistook the man sitting under the tree for that spirit). The Buddha had previously sought enlightenment by fasting, but this had only weakened his body. Eating the milk-rice gave him the strength and nourishment enabling him to focus his mind (and become enlightened), but it also illustrates the "middle path" attitude toward the body--caring for it so that it is healthy, but not indulging it.
As already mentioned, the figure of Mara (here seated just left of center) is a symbol for the desires and attachments that bind people to the world, and in becoming enlightened, the Buddha thereby "vanquished" him. Aside from sending his demon armies to frighten the Buddha, Mara is also said to have sent his three "daughters"--Discontent, Delight, and Craving"--who are visible just to the right of the tree. Needless to say, these daughters were also unsuccessful.