What were the main events at Stalingrad?

Explanation:

N Red Army begins Operation Uranus to encircle the German army, Encirclement is complete trapping roughly 290,000 Axis troops,  Field Marshal von Manstein's army group launches an attack to relieve the German army in Stalingrad.

2. a land bridge connected asia and north america thousands of years ago.

4. crossing the land bridge would have been simple for the first migrants.

5. people might have crossed a land bridge while hunting animals.