Ash Shahrul Haraamu bish Shahril Haraami wal hurumaatu qisaas; famani'tadaa 'alaikum fa'tadoo 'alaihi bimsisli ma'tadaa 'alaikum; wattaqul laaha wa'lamooo annal laaha ma'al muttaqeen
[Battle in] the sacred month is for [aggression committed in] the sacred month, and for [all] violations is legal retribution. So whoever has assaulted you, then assault him in the same way that he has assaulted you. And fear Allah and know that Allah is with those who fear Him.
1 Mufti Taqi Usmani
The holy month for the holy month, and the sanctities are subject to retribution. So when anyone commits aggression against you, be aggressive against him in the like manner as he did against you, and fear Allah, and be sure that Allah is with the God-fearing.