This was a response to some Yemeni soldiers who had complained about Ali.
Southern secessionist groups said they were holding three Yemeni soldiers kidnapped towards the end of January.
Northern Yemeni soldiers controlling the area and closing in on Aden said they were moved 10 days ago.
Some 400 Yemeni soldiers have now been deployed at more than 12 bases near the border.
At least 5 Yemeni soldiers and local militia members were also killed during the fighting.
Foreigners have not been targeted, but hundreds of Yemeni soldiers and civilians have been killed in the fighting.
Yemeni soldiers in Sana'a: the cables reveal concerns over security in the country.
Last week, 15 rebels and 5 Yemeni soldiers were killed in the clashes.
At least six militants and two Yemeni soldiers were killed in a shootout on 19 April.
At least two militants were killed and one Yemeni soldiers were killed.