Injured Vietnamese receive aid as they lie on the street after a bomb explosion outside the U.S. Embassy in Saigon, Vietnam, March 30, 1965

• 
  Mar 30 1972 – Vietnam: The Easter Offensive begins with Hanoi launching its heaviest attack in four years, crossing into the DMZ. A major coordinated communist offensive opens with the heaviest military action since the sieges of Allied bases at Con Thien and Khe Sanh in 1968. Committing almost their entire army to the Easter offensive, the North Vietnamese launched a massive three-pronged attack into South Vietnam. Four North Vietnamese divisions attacked directly across the Demilitarized Zone in Quang Tri province. Thirty-five South Vietnamese soldiers died in the initial attack and hundreds of civilians and soldiers were wounded.
  
• 
  Mar 31 1776 – American Revolution: Abigail Adams writes to her husband, John Adams, urging him and the other members of the Continental Congress not to forget about the nation’s women when fighting for America’s independence from Great Britain.
  
• 
  Mar 31 1865 – Civil War: The final offensive of the Army of the Potomac gathers steam when Union General Philip Sheridan moves against the left flank of Confederate General Robert E. Lee’s Army of Northern Virginia near Dinwiddie Court House. The limited action set the stage for the Battle of Five Forks, Virginia, on 1 APR.
  
• 
  Mar 31 1905 – WWI: Kaiser Wilhelm of Germany arrives in Tangiers to declare his support for the sultan of Morocco, provoking the anger of France and Britain in what will become known as the First Moroccan Crisis, a foreshadowing of the greater conflict between Europe’s great nations still to come, the First World War.
  
• 
  Mar 31 1940 – WW2: The German auxiliary cruiser Atlantis sets off on a mission to catch and sink Allied merchant ships. By the time the Atlantis set sail from Germany, the Allies had already lost more than 750,000 tons worth of shipping, the direct result of German submarine attacks. They had also lost another 281,000 tons because of mines, and 36,000 tons as the result of German air raids. The Germans had lost just eighteen submarines.
  

• 
  Mar 31 1941 – WW2: Germany begins a counter offensive in Africa.
  
• 
  Mar 31 1965 – Vietnam: Responding to questions from reporters about the situation in Vietnam, President Johnson says, “I know of no far-reaching strategy that is being suggested or promulgated.” Early in the month, Johnson had sent 3,500 Marines to Da Nang to secure the U.S. airbase there. These troops were ostensibly there only for defensive purposes, but Johnson, despite his protestations to the contrary, was already considering giving the authorization for the U.S. troops to go from defensive to offensive tactics.
  
• 
  Mar 31 1968 – Vietnam: In a televised speech to the nation, President Lyndon B. Johnson announces a partial halt of bombing missions over North Vietnam and proposes peace talks. He said he had ordered “unilaterally” a halt to air and naval bombardments of North Vietnam “except in the area north of the Demilitarized Zone, where the continuing enemy build-up directly threatens Allied forward positions.”
  
• 
  Mar 31 1972 – Vietnam: After firing more than 5,000 rockets, artillery, and mortar shells on 12 South Vietnamese positions just below the Demilitarized Zone, the North Vietnamese Army launches ground assaults against South Vietnamese positions in Quang Tri Province. The attacks were thrown back, with 87 North Vietnamese killed
  
• 
  Mar 31 1991 – Cold War: After 36 years in existence, the Warsaw Pact—the military alliance between the Soviet Union and its eastern European satellites—comes to an end. The action was yet another sign that the Soviet Union was losing control over its former allies and that the Cold War was falling apart.
  

[Source: http://www.history.com/this-day-in-history | March 2018 ++]