So Abimelech went up to Mount Zalmon, he and all the people who were with him, and Abimelech took axes in his hand and cut down tree branches and picked them up and laid them on his shoulder, and he said to the people who were with him, “What you have seen me do, hurry and do as I have done!”

“Mount Zalmon.” Mentioned here and in Psalm 68:14.
“tree branches.” The Hebrew word translated “branches” is uncommon and seems to refer to smaller clusters of branches, which would burn fast and hot. The word “trees” is plural.