What happened 400 years ago?

Rancke March 14, 2013 User blog:Rancke

I'm rereading Echoes of Honor and came across a statement about the Manticore-Haven War being "an interstellar war on a scale the galaxy hadn't seen in at least four hundred years". So what happened 400 years ago that might arguably be comparable to the Manticore-Haven War?

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