The numbers are eye watering. I got these stats from the Royal British Legion website.
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D-Day was the biggest seaborne invasion and the greatest military campaign the world has seen.
Allied troops landed in Normandy156,115
American (Omaha & Utah beaches + airborne)73,000
British (Gold & Sword beaches + airborne)61,715
Canadian (Juno Beach)21,400
Airborne troops (included in figures above)23,400
Aircraft supporting the landings 11,590
Sorties flown by allied aircraft14,674
Aircraft lost 127
Naval vessels in Operation Neptune6939
Naval combat ships1213
Landing ships and landing craft4126
Ancillary craft736
Merchant vessels864
Personnel in Operation Neptune 195,700
American52,889
British112,824
Other allied4988
By the end of 11 June (D + 5), 326,547 troops, 54,186 vehicles and 104,428 tons of supplies had been landed on the beaches.
As well as the troops who landed in Normandy on D-Day, and those in supporting roles at sea and in the air, millions more men and women in the Allied countries were involved in the preparations for D-Day. They played thousands of different roles, both in the Armed Forces and as civilians.