Improvised Explosive Devices, or IEDs as they're now known, have become commonplace in 21st century warfare. But these types of booby traps have been around for years. During the Vietnam War, the Viet Cong and North Vietnamese Army found numerous unexpected and deadly ways to attack American soldiers. For example, early on in the Southeast Asian conflict, the VC noticed that American soldiers liked to kick empty soda cans that were left lying on the ground. So the VC rigged those cans with explosives and planted them along regular patrol routes. When the cans were kicked down the road, they'd explode, causing injury or death.
More on sneak attacks in Vietnam:
The statistics (roughly) are that
about 51,000 US soldiers were killed and 687 Australians were killed.
Compare the soda cans to the bombing:
About 4.1 million Vietnamese people killed. An ideological war? Hardly.
The Vietnamese regarded the US and Australia as Colonial power number 3 after the Chinese and the French.
They were protecting their homeland from another threat of subjugation. Watch the video "The Fog of War".