Something tells me you are including the people killed in that Union cannon explosion as "casualties at Confederate hands." You tend to be quite liberal with your interpretations when it favors your side.
And how many of these Union casualties occurred in Union states? (and no, you can't count West Virginia, which was illegally made into a state.)
Every one of those Union soldiers would be alive and whole except for the Confederate attack on Fort Sumter.
They were casualties of the battle, period.
For a Pearl Harbor analog: some Hawaiian civilians were tragically killed by US anti-aircraft rounds falling back to earth.
But you can't says that's not ultimately the fault of the Japanese attack.
DiogenesLamp: "And how many of these Union casualties occurred in Union states? (and no, you can't count West Virginia, which was illegally made into a state.)"
So somehow you fantasize it was constitutional for Virginia to declare secession, but not for West Virginia?
You know, with your double standards you truly are a Democrat, you mind works like the typical Democrat mind -- one set of rules for thee, different rules (or no rules) for me.
In fact, West Virginia's statehood is totally constitutional & lawful and has never been successfully challenged in court.
Nor has Virginia ever attempted to force West Virginia's return.
The real truth is those people didn't much like each other and were just as happy to go their own ways.