Battle at the S.H.I.E.L.D. Academy

"What's happening?" "Have your commander report that the academy is under siege... We don't know how long HYDRA's been inside S.H.I.E.L.D. but they're taking control." "HYDRA? What? Where?" "Everywhere, among us.""

- Jemma Simmons and Anne Weaver

The Battle at the S.H.I.E.L.D. Academy was the battle between HYDRA and S.H.I.E.L.D.. It was a part of the S.H.I.E.L.D. Civil War.

Battle
During the beginnings of the S.H.I.E.L.D. Civil War agents from the S.H.I.E.L.D. Academy were revealed to be undercover HYDRA operatives and attacked the Academy. Head of the Academy Anne Weaver was able to contact her former student Jemma Simmons and Antoine Triplett, who were stationed at the Hub and were currently unaware of the attack. Weaver used this time to warn Simmons and Triplett of the HYDRA threat before being cut off.

HYDRA unleashed an enhanced individual to take the S.H.I.E.L.D. Academy. Weaver managed to fight him toe to toe for a while, but she would have eventually lost if Agent Tomas Calderon had not arrived with a squadron of Quinjets to help save the Academy.

Aftermath
"We didn't even know if you were alive." "If it weren't for Agent Calderon, I wouldn't be. He co-opted a squadron of Quinjets to come to the academy. He saved us. If it weren't for him, we would have lost even more young, talented minds that day."

- Jemma Simmons and Anne Weaver

The saved students and agents were transported to the aircraft carrier Iliad, where HYDRA's moles were defeated through the efforts of Bobbi Morse, Isabelle Hartley, and Alphonso Mackenzie. The agents assembled on the ship eventually became the core of Robert Gonzales' S.H.I.E.L.D. faction.