Horn of shaitaan;anniversary;crow

Salaams mufti saheb i have 3 questions

With regards to the followers of Muhammed ibn Abdul Wahab,Nabi(S.A.W) has said that the horn of shaitaan will emerge from najd,and according to my research, his brother,had told him that the Hadith was reffering to Muhammed Ibn Abdul Wahab.I thereafter came to the conclusion that him and his followers are wrong.In 1343A.H he conqured the holy lands.My questions is,in Mufti saheb’s opinion how did Allah(SWT) allow for him to do that?Jazaakallah.