Acts of vandalism
In what year was the painting vandalized with acid?
The Night Watch
Woman in a Red Armchair January 1911 The Spear (painting) Vandalism of art Gertie Gets Her Ducks in a Row
Woman_in_a_Red_Armchair-Vandalism January_1911-January_13,_1911_(Friday) The_Spear_(painting)-Abstract Vandalism_of_art-Night_Watch Gertie_Gets_Her_Ducks_in_a_Row-Vandalism
On June 13, 2012, the painting was vandalized while on display at the Menil gallery by a 22-year old man named Uriel Landeros (who would later get his own art show for vandalizing the painting). 
 "De Nachtwacht", painted in 1642 by Rembrandt van Rijn, was vandalized for the first time at the Rijksmuseum Amsterdam. A recently unemployed cook slashed through the 209 year old canvas with a knife. On September 14, 1975, a retired schoolteacher cut through the 333 year old painting and tore off a section in the center, and on April 6, 1990, another vandal sprayed sulfuric acid on the now 358 year old masterpiece, which has been restored each time. Born: Joh Bjelke-Petersen, Premier of Queensland (d. 2005)  
The Spear is a painting by Cape Town-based South African artist, Brett Murray. It depicts South African President Jacob Zuma in a pose reminiscent of Lenin, with his genitals exposed. The painting triggered a defamation lawsuit by Zuma's party, the African National Congress (ANC), and was vandalized on 22 May 2012. 
Rembrandt's "Night Watch" (1642) is one of the most popular paintings at the Rijksmuseum in Amsterdam. It is viewed by about 4,000 to 5,000 visitors daily with its value estimated at $925,000 in the 1970s. The painting was vandalized on several occasions. On 13 January 1911, an unemployed navy cook tried to cut it with a knife, but could not cut through the thick varnish on the painting. In 1975, William de Rijk, an unemployed school teacher, cut dozens of zigzag lines in the painting with a knife before he was wrestled by the guards. The day before, de Rijk had been turned away from the museum because he arrived after closing time. After the event, he was identified with a mental disorder; he was sent to a psychiatric hospital and committed suicide there on 21 April 1976. The painting was restored, but traces of the cuts still remain. In 1990, a man threw acid on the painting. The guards managed to quickly dilute it with water so that it penetrated only the varnish layer, and the painting was restored again. 
The work was repeatedly vandalized following its installation. After the ducklings were stolen from the work in March 2012, Rothschild told the "Milwaukee Journal Sentinel", "I am really frustrated with what has happened here... This is a work that was designed to be uplifting and inspiring for people from different generations."