The battle of Hornburg Part 2

In part 1, Isengard attacks the fortress Hornburg, a Establishment build in Helms Deep. The First Wave was defended well, but there was a lot more to come,

Part 2, An Orc brought Sarumans "Fire Orthanc" an the Helm's Dike exploded. Then the Second Wave marched out of the woods, This army was larger and even had Ballistas and Shielded orcs. The orcs invaded the the castle but just before surrender, Gandalf and Erkenbrand showed up with a thousand horses. The Orcs fled back into the woods and the battle was over.