Related Clues:

• When to launch an invasion
• Betray surprise
• ''Saving Private Ryan'' event
• Make the first move
• Onset
• WWII event
• Dive in
• 6/6/1944
• Many solvers do it here
• Memorable date in history
• 40's turning point
• Brief shock
• Get cracking
• All the clues in this puzzle do this with 36-Across
• Get the ball rolling