In Robert's war story, another important event was his uniting of the various houses against the Targaryens. He managed to get the support of houses like the Stark and the Lannister. This alliance was crucial in the war. The Starks brought their military might from the North and the Lannisters provided financial and military resources. Without this united front, it would have been much more difficult for Robert to succeed in overthrowing the Targaryen rule.
One of the most memorable events was his victory at the Trident. His battle against Rhaegar Targaryen there was a turning point. He killed Rhaegar with his warhammer, which was a huge moment that led to the downfall of the Targaryen dynasty.
Well, in Robert's war story, the siege of Storm's End was also quite significant. His family held the castle against the Targaryen forces for a long time. This showed the loyalty and tenacity of House Baratheon. It was also a factor that made Robert a more prominent figure in the rebellion against the Targaryens as his family had withstood such a long and difficult siege.