So I was bored and thought about it.
Magic vs. Technology
Edit: Everyone is alive in HPU and all canon SWU is alive. Both sides are aware of the upcoming battle. Planet killer attacks not allowed.
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Star Destroyers launch orbital bombardment of Hogwarts, and other key locations in the HP Universe. Tie bombers/AT-AT's/AT-ST's/Stormtroopers mop up the rest. Vader & Sidious ponder why the -blam!- they even bothered invading this planet. Pull all forces from said shit-hole, and light it up with the Death Star. [b][i][u]THE END.[/u][/i][/b]