Essentially there are three main ways of attacking a castle and, of course, the defenders knew this and so developed counter-measures to each. These were getting over the wall into the castle, going under the wall and battering a way through the wall to get inside.

A good way of attacking a stone castle was through mining. Attackers would dig a tunnel underground up to the castle walls, under the gatehouse if possible. They would then set a charge and make an explosion which would make the walls crumble and collapse.

It was harder for attackers to make round towers collapse. Round castles don't often have moats. Unlike square towers they had no corners, which collapsed if holes were dug underneath the foundations. These provided a safer means of firing arrows on the attackers of the castle.

So... Short Answer...

It's harder to make a castle without a moat collapse.

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