Normally, the myths focus on the enemyship between Hera and Heracles. They are directly mentioned. But you know what isn't really directly mentioned, but you can see that it does imply another enemyship? Ares and Heracles.
And this starts since Heracles' sixth labor: the Stymphalian birds. Those were Ares' birds, those were sacred to him!! And Heracles killed them!!
And not many tasks later, Heracles went for Diomedes of Thrake, Ares' son, and his mares. (Probably) Ares had gifted him those mares, Diomedes fed them with human flesh, and Heracles decided to give him a taste of his own medicine and fed the son of Ares to his own mares. And then stole the mares.
Just a task later, Heracles ends up killing yet another child of Ares. This time Hippolyte and other Amazons (depends on the version, kinda), and steals her belt, which had also been given by Ares. It is true it was a trick of Hera, but what mattered back then was who had their hands full of blood.
Only a task later, Heracles, to steal the cattle of Geryon, killed Chrysaor, who Ares appreciated a lot. And idk if this is true, but I heard that Eurytion (the herdsman) was also son of Ares. Oh, and also killed Geryon, who was son of Chrysaor, but idk if I should include it...?
Later, Heracles also killed Cycnus, another son of Ares. Appearently, Ares had enough of this bastard of his father that his mother for whom he'd persecuted Leto for killing his children, so he stepped in to fight him. But Zeus, with a lightning bolt, separated the two before fighting, so Ares, still wanting to kill him tho, had to step back. (Fun fact, I've read that he turned Cycnus into a swan, and maybe even set among the stars as a constellation.)
So, uh...
+3 (since we don't know how many Amazons were killed) children killed.
2 (or 6, since the mares were four, as far as I know) gifts for his children stolen.
An unspecified number of sacred birds killed.
1 beloved colleage killed.
And 1 grandson killed.
Also, Heracles was (probably) one of Zeus' favorites and, after his apotheosis, I've read that Hera loved him like he was her own son. He even married Hebe, goddess of youth and daughter of Zeus and Hera.
I don't wanna imagine what it felt like for him to see this bastard who his mother used to hate and who took the life of so many his beloved children and non-children, stealing the gifts he had given them, or killing the birds he very much loved in, now being even more loved by him and marrying his younger sister who used to take care of him (she bathed him and helped him put on his clothes, which ig were difficult to put on alone?).
