His brother got close enough to the wall to rip open the gate. They all saw him coming and there wasn't fukk all they could do about it due him being a giant.
It was like 8000 Wildlings vs 100 NW members. He had cover fire galore, mammoths, the height of the wall, and the night to help him get evade arrows.
But what happened when he got close enough for hand to hand combat? He got killed by 6 weak ass Nights Watch brothers that were scared as hell. What would an entire well trained army do to him?
A giant sent on his own to break down a wall with thousands of archers, thousands of Calvary, and thousands of foot soildersposted would get murdered before he made it 1000 feet to the walls of Winterfell.
I'm sure Jon plans to use Wun Wun to break Winterfells main gate, but he has to reach it first. And he isn't stealthing a giant across that huge open field before his ass gets shot down.
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