Hawthi resilience

I asked comrade Fawwaz Trabulsi on how the Yemeni army does not seem to be able to defeat the Hawthi rebels after more than four years of bombing and fighting. He wrote me this (I cite with his permission): "i myself am more than amazed, as`ad. cant find a convincingin explanation yet. when you ask yemeni friends, they list many factors: i) the mountainous terrain and fighting tradition of yemeni tribes; ii) the corruption and weak morale in the army. there is a tradition that the general is paid say for 3000 soldiers in his unit and he would have 1700! he gets the rest for himself; iii) jihadis prepared to die, etc."