The Trat border was intensely contested all night, with a new frontline opening at Hat Lek. Warships bombarded gun emplacements on Koh Yor, destroying all four artillery bases. Cambodian civilians urgently evacuated, causing traffic congestion.
On 13 December 2025, reports indicated that throughout the previous night, the Thailand-Cambodia border situation in Trat province, specifically in Chamrak subdistrict, Mueang district, remained intermittently active with clashes involving artillery, machine guns, and small arms fire until dawn.
At 02:00, gunfire was heard in Ban Hat Lek, Hat Lek subdistrict, Khlong Yai district, Trat province. Intelligence revealed that Thai forces had fired over 10 artillery shells toward targets on Koh Yor in Ban Pak Khlong, Koh Kong province, after detecting movements potentially threatening to Thailand. Consequently, they successfully destroyed all four artillery bases there.
Cambodian media reported that the navy fired more than 20 artillery rounds at Ban Pak Khlong in Koh Kong province, forcing local villagers to evacuate urgently, which caused traffic congestion.