<P> After these reversals of fortune , which saw Seoul change hands four times , the last two years of fighting became a war of attrition , with the front line close to the 38th parallel . The war in the air , however , was never a stalemate . North Korea was subject to a massive bombing campaign . Jet fighters confronted each other in air - to - air combat for the first time in history , and Soviet pilots covertly flew in defense of their communist allies . </P>
<P> After these reversals of fortune , which saw Seoul change hands four times , the last two years of fighting became a war of attrition , with the front line close to the 38th parallel . The war in the air , however , was never a stalemate . North Korea was subject to a massive bombing campaign . Jet fighters confronted each other in air - to - air combat for the first time in history , and Soviet pilots covertly flew in defense of their communist allies . </P>
where did most of the fighting take place in the korean war
where did most of the fighting take place in the korean war
close to the 38th parallel
close to the 38th parallel