Direct proof of use
The M1 Abrams appears in the 2014 Yemen Civil War through Saudi use of U.S.-supplied tanks during the Saudi-led intervention against Houthi-aligned and pro-Saleh forces. FDD's Long War Journal reported in September 2015 that Houthi media showed captured and destroyed Saudi M1 Abrams tanks during fighting in Yemen and southern Saudi Arabia, including footage from the Jizan border region.
A later Defense One report tied the battlefield-loss record to an August 2016 U.S. arms-sale notice. The Defense Security Cooperation Agency notice approved up to 153 M1A1/A2 tank structures for conversion to Saudi M1A2S Abrams configuration, including 20 battle-damage replacements for Saudi Arabia's existing fleet; Defense One reported that those replacements were understood to cover Saudi Abrams lost in combat during the Yemen war.
Sources: Long War Journal Abrams Losses, Defense One Saudi Tank Deal, DSCA Saudi M1A2S Notice
Timeline
Saudi Arabia and coalition partners intervened in Yemen in March 2015 after Houthi-aligned forces advanced toward Aden and President Abdrabbuh Mansur Hadi fled. The Abrams evidence appears early in that intervention, with September 2015 reporting describing Saudi tanks captured or destroyed in Houthi and pro-Saleh attacks along the border and in Yemen-related fighting.
On August 9, 2016, DSCA announced the proposed Saudi M1A2S sale and included 20 battle-damage replacements in the package. The notice did not name Yemen as the loss location, but Defense One connected the replacements to Saudi losses in the Yemen war and cited earlier reports and videos of Abrams losses.
Sources: CFR Yemen and Red Sea Tracker, Long War Journal Abrams Losses, Defense One Saudi Tank Deal, DSCA Saudi M1A2S Notice
Battlefield role
The documented Abrams role was coalition armored combat, primarily associated with Saudi ground and border operations against Houthi-aligned forces. Long War Journal described Houthi and pro-Saleh fighters using anti-tank missiles against Saudi armor, capturing U.S.-supplied Abrams tanks, and destroying some of them after capture or attack.
The public evidence is strongest for Saudi operation of Abrams tanks and for combat losses, rather than for a complete operational history of every Saudi armored action in Yemen. The 2016 U.S. sale notice adds official support for the existence of battle-damaged Saudi Abrams requiring replacement, while the Yemen-specific attribution of those losses comes from defense reporting and open-source battlefield imagery summarized by Long War Journal and Defense One.
Sources: Long War Journal Abrams Losses, Defense One Saudi Tank Deal, DSCA Saudi M1A2S Notice