Analysis of information sources in references of the Wikipedia article "Bataan Death March" in English language version.
He had learned how 76,000 American and Filipino prisoners had been force-marched.[...] The 18,000 prisoners who couldn't make the Bataan death march had been either shot or beaten to death along the way.
Between 7,000 and 10,000 died or were killed during the "Bataan Death March" ... Somewhere between 6,000 to 18,000 POWs died or were murdered during the Death March
On April 11th, once the surrender of the I Corps was completed, the Filipino and American troops in western Bataan began their slow assembly. From the front lines south of the Pilar-Bagac road and from the jungle slopes of the Mariveles Mountains, they straggled in disorganized groups to the West Road. Then they went either north or south, to Bagac or Mariveles, an uncoordinated mass of men and vehicles moving with little direction from the Japanese.