What do wolves do for defense?

When in danger, wolves use some of the following tactics to "protect" themselves and/or avoid conflict with other wolves, species, etc.:

1. Body Language: Tail level, bristling of fur, wrinkling of lips, flattened ears, etc. Various combinations of these used to warn and/or show emotions of fear, anger, agitation, and much more.

2. Physically Defending: Basically meaning fighting back. This is usually a "last resort" and rarely ever results in death. Despite said fact, these brawls are brutal and serious injuries can occur.