Boiled_Cabbage
Was about to answer that, lol.
The blast overwhelms the remaining dreadnoughts, destroying or crippling those left. But even without the dreadnoughts, the Imperial fleet commands more than enough firepower to finish the fledging revolt on Holdhaven if more aid does not come, and soon.
On the boarded ships, the troops finally carve their way past the defenses on a tidal wave of their brother's corpses, and storm onto the bridges.