Pieter Hendrik van der Scheer was a conscript from 1939 until the end of the war, assigned to the Vickers M.C. 3rd Bat. 19th Reg. IVth Infantry Division and took part in the fighting during the combat days of May 10-15, 1940, in the vicinity of the Grebbeberg 
By until the end of the war is meant here the time until the surrender of the Dutch Army on May 15, 1940. Because then the war in the Netherlands was over for the time being. Demobilized soldiers were offered jobs in the police force, among other things.
From the end of 1940, the members of the NSB and especially of the WA  were increasingly aggressive against political opponents. During a brawl between members of the WA (similar to the German SA) and the Dutch Union, Van der Scheer and his colleagues tried to keep order. Shots were fired, killing an NSB member and Van der Scheer. 
The municipal administration of Nijmegen wrote about this to the Oorlogsgravenstichting (War Graves Foundation) after the war:
The deceased, during the occupation, as a fighter for law, public order and safety, until his violent death, resisted the violation of Dutch laws protecting the population from arbitrariness and terror on the part of the occupier and his accomplices. On March 21, 1941, while lawfully intervening against a roundup of an armed band of W.A. and N.S.B. bandits on the street in Nieuwenhagen, who were openly rioting together and committing violence against persons and, inter alia. some of his comrades on patrol, who were violently attacked and severely maltreated by these bandits when they attempted to restore order and security, and were thus in imminent danger of their lives, he was severely wounded by gunfire when he intervened to free his comrades and died shortly thereafter 
He is buried in the cour d’honneur of the municipal cemetery Vredehof in Nijmegen, grave 3.