
This blog is more likely to be read by someone from the San Francisco area than from, say, El Paso. That red dot is Atlanta, I think.
After Set killed Osiris, Horus had many battles with Set, not only to avenge his father, but to choose the rightful ruler of Egypt. One scene stated how Horus was on the verge of killing Set; but his mother (and Set's sister), Isis, stopped him. Isis injured Horus, but eventually healed him.
By the Nineteenth dynasty, the enmity between Set and Horus, in which Horus had ripped off one of Set's testicles, was represented as a separate tale. According to Papyrus Chester-Beatty I, Set is depicted as trying to prove his dominance by seducing Horus and then having intercourse with him. However, Horus places his hand between his thighs and catches Set's semen, then subsequently throws it in the river, so that he may not be said to have been inseminated by Set. Horus then deliberately spreads his own semen on some lettuce, which was Set's favorite food (the Egyptians thought that lettuce was phallic). After Set has eaten the lettuce, they go to the gods to try to settle the argument over the rule of Egypt. The gods first listen to Set's claim of dominance over Horus, and call his semen forth, but it answers from the river, invalidating his claim. Then, the gods listen to Horus' claim of having dominated Set, and call his semen forth, and it answers from inside Set.