syria. cnn's chief correspondent clarissa ward is inside syria and takes us to the front line. >> reporter: the battle against isis is still raging. as the u.s. ally syrian democratic forces known as the sdf push in on the last sliver of territory under the militant's control. here the fighters prepare to move into the village of shapa. flares turn the dark night into day. coalition aircraft circle overhead, providing crushing air power. by daylight, they push further in. this is where isis ends, sdf commander tells his men. moments later, panic breaks out, isis has launched a counterattack. the sdf fire back and shapa is