thanks. we ll hear much more about the president s libyan policy tonight. he sits down for a one-on-one interview with our own diane sawyer. you ll see that tonight on abc s world news. in libya rebels have successfully pushed the front to gadhafi s hometown of sirte where they acknowledge they could not have held their ground without international air and cruise missile strikes. alex marquardt reports from the eastern city of benghazi. reporter: rebels are on the march with gadhafi s stronghold in their sights. but gadhafi s forces are fighting back. since saturday the rebels have been on a roll, pushing west, recapturing key oil towns without a fight. now trying to take gadhafi s hometown, the first stop in the west in the plan to march on tripoli. their lightning fast advance, their turn-around has been paved by international air strikes. coalition jets swooping in, taking out gadhafi s tanks and