PDF Download Version. The Vietnam War defined a generation, whether it was through service in Vietnam or opposition to the war. It remains one of the longest and bloodiest wars since the Second World War.The Free World had all of the advantages of mobility and firepower. Whole battalions flew into battle in helicopters. Armoured cavalry and mechanised infantry used their M113 ‘tracks’ both for mobility and heavy firepower. Of course, the majority of soldiers were still ‘grunts’ fighting on foot, but even they could call in massive firepower at will.The Nationalists had the advantages of the home team. They fought as guerrillas, appearing as if from nowhere to ambush the Free World forces hunting them and outwitting their foes. Later, as the war progressed, they switched to conventional tactics using armoured forces in open battle.