thank you, now to retired general mark hertling. so hertling, according to the commander of all the asov battalion in mariupol, now breached the steel mill and engaged in close fighting with ukrainian forces inside. can you talk a battle like that, how difficult to storm an industrial complex, heavily fortified with a lot of underground bunkers and tunnels? yeah, this is going to be really tough, anderson. if they think they ve seen fighting there already it s knowing to get much worse. this is a lot like fighting in a cave and that s something the u.s. army found very difficult in preparing for missions in afghanistan and to a lesser degree, eastern iraq. we built cave complexes at our training centers and we quickly found out how challenging it was for any attacker going into a cave and how very few armed men, defending in a cave, could hold off, sometimes hundreds even thousands of attackers going into a cave. now the asovstal plant is