On 22 December 2018 Cammaert started leading the UN monitoring mission to oversee the UN-brokered ceasefire and redeployment of forces in the city of Al Hudaydah in Yemen.[5][2] On 17 January 2019, Cammaert's convoy was reported to have been fired upon by unknown assailants, thought Cammaert remained uninjured.[6] By February 2019, he was replaced with Danish Major General Michael Anker Lollesgaard.[7]