This is the sixth in a series of posts on Jihad in Fiqh. Al-Ghazali confirms the one ghazwat per year minimum requirement.
al-Ghazali, d. 1111, shafi’i, sufi. Kitab al-Wagiz fi fiqh madhab al-imam al-Safi’i (Beirut 1979), s. 186, 190-1, 199-200, 202-3, övers. Michael Schub.
One must go on jihad (i.e. warlike razzias or raids) at least once a year […] one may use a catapult against them [non-Muslims] when they are in a fortress, even if among them are women and children.
This matches Umdat as-Salik & the opinion of Al-Shafi’i. It is the law because of Allah’s command and Moe’s example.