However, with necessity, they developed an increasing number of defensive features.

The reason for building the mound is uncertain, but it was almost certainly not designed as a serious defensive feature.

A bent entrance is a defensive feature in mediaeval fortification.

Although impressive, these are likely to have been fashionable embellishments rather than genuine defensive features.

The central tower house, or keep, is surrounded by a 15th-century courtyard wall with "particularly fine" defensive features.

The site also had several natural defensive features.

It would have been shorter than the actual line, and taken advantage of natural defensive features, making it more formidable.

They are often difficult to access, which, in ancient times, was a defensive feature.

There are also hybrid shield/weapons that have both an offensive and a defensive feature.

These include the temples built in the area, sacred rivers, mines and defensive features.