Thursday, Nov. 5, a substantial Saudi armored infantry force and tank column crossed the border into Yemen to do battle with Iran-backed Houthi rebels the day after they killed a Saudi border guard. Saudi air force F-15 and Tornado jets have been bombing Yemeni rebel positions near the border with the southern Saudi Jizan province since Wednesday.
"This is not a hit-and-run, this is a sustained action," said a Saudi official Thursday night.