Original sentence: On 12 February, Houthis shot down a Saudi Arabian CH-4 drone with a OSA surface to air missile and provided footage of the shotdown of the drone
Edited sentence: ", according to pro-Hadi officer.Houthis shot down a Saudi Arabian CH-4 drone with a OSA surface to air missile and provided footage of the shotdown of the drone.On 12 February, Pro-Hadi forces said they repelled a Houthi attack on Ma'rib city after Saudi-led coalition provided air support, "killing 60 Houthi fighters", pro-Hadi officer reported.On 20 February, the pro-Hadi army units launched artillery shelling and "killed a total of 40 members of the Houthi militia in Marib's northern outskirts.On 27 November, Pro-Hadi scources claimed that 21 Houthis were killed in artillery bombardment in Ma'rib