He had a war hammer, ready and hanging on the wall for when the time came to jump back into war.
He too favored a hammer over a sword, and it was with a war hammer that the fate of the Seven Kingdoms was decided a generation ago.
Ser Davos found Gendry working as a blacksmith once again, and Gendry revealed that he was much more comfortable wielding a hammer rather than swinging a sword.
His choice of weapon mirrors that of his father, Robert.