However , Kesiny developed Coming_to_be an eye and re-intensified Cause_change_of_strength into a tropical cyclone Catastrophe on May 9 , reaching Achieve peak winds of before striking Attack Madagascar about southeast of Antsiranana .

It began Process_start with Operation Ironclad , the seizure Conquering of the port of Diego-Suarez ( now Antsiranana ) near the northern tip of the island , on 5 May 1942 .