Nevertheless , the left horn of the Zulu advance was moving to outflank and envelop the British right .
Additionally , the shell fire of the Royal Artillery forced some Zulu regiments to take cover behind the reverse slope of a hill .
The left horn of the Zulu advance was moving to outflank and envelop the British right .
Additionally , the shell fire of the Royal Artillery forced some Zulu regiments to take cover behind the reverse slope of a hill .