His nephew Raymond was Strongbow's second-in-command and had the chief share both in the capture of Waterford and in the successful assault on Dublin in 1171. Lord Lanstephan and his sons the FitzMaurices also fought in this battle.
Strongbow's cousin Raymond played a crucial role as his deputy, participating in both the capture of Waterford and the successful siege of Dublin in 1171. The Lord of Lanstephan and his sons, the FitzMaurices, were also involved in this battle.