اَللَّهُمَّ بِكَ أُحَاوِلُ وَبِكَ أُقَاتِلُ وَبِكَ أَصَاوِلُ

Allaahumma bika o-'haa-wilu wa bika o-qaatilu wa bika asaa-wil

Ya Allah! I try by your help, fight by your help, show courage by your help and be victorious by your help.

Reference: Sahih (Albani). Darimi: 2/217