Why was the Tet Offensive a military defeat for North Vietnam and the Viet Cong?

The Tet Offensive was a resounding military defeat for North Vietnam and the Viet Cong because their primary strategic objectives failed to materialize. Communist leadership had gambled on a conventional assault intended to trigger a popular uprising, collapse the South Vietnamese government, and sweep aside its military forces.1

Instead, the offensive resulted in the following military failures:

• Failure of Popular Support: The expected mass revolt against the Saigon government never occurred; instead, the widespread destruction caused by the attacks alienated many South Vietnamese civilians, leading to a decline in support for the Viet Cong.12
• Tactical Reversal: By abandoning their traditional guerrilla warfare tactics in favor of conventional urban assaults, the North Vietnamese forces pitted themselves against the superior organizational, material, and logistical capabilities of U.S. and South Vietnamese troops.1
• Heavy Casualties: The North Vietnamese and Viet Cong suffered unprecedented losses, with estimates of communist deaths reaching as high as 60,000.1
• Loss of Territory: With the notable exception of Hue, where fighting lasted for weeks, communist forces were driven out of the cities and bases they had briefly occupied within days of the initial attacks.12