The Queen of the Amazons was inspecting her troops when the Queen of Atlantis found her. Her personal guard surfaced first, drawing fire from the Amazons, leaving Diana for Mera alone. But for all the noble intent behind Mera's attack, the best that can be said is that it was over quickly. The Sea King would never learn what became of her head; her helmet was another story...
Mera's Final Appearance Before "The New 52"
Emperor Aquaman # 3
Art by Vicente Cifuentes