It is recommended that you use some sort of tokens or markers to help remind you of things such as which units have charged, fled, rallied etc, as well as if they are under the effect of some spell or special rule.
Source: Warhammer Armies Project
It is recommended that you use some sort of tokens or markers to help remind you of things such as which units have charged, fled, rallied etc, as well as if they are under the effect of some spell or special rule.