Many weapons, such as the Great Sword favoured by some Empire troops or the Great Axes of the Dwarfs, are very heavy and require considerable training and stamina to wield. Such a weapon is described by the term strikes last.
Troops armed with a weapon that strikes last will always strike last during close combat where they would otherwise strike in Initiative order. Note that troops that charge will still strike first in the initial turn of close combat, as charging troops always strike first rather man in Initiative order. For example, troops armed with Great Axes will strike first on the turn they charge and strike last thereafter.