Assassination of Lord Mountbatten saw 164x more Wikipedia readers than usual

What this article is

Lord Mountbatten, a retired British statesman and cousin to Queen Elizabeth II, was assassinated on 27 August 1979 off the coast of Mullaghmore, Ireland. Thomas McMahon, an Irish republican and a volunteer for the Provisional Irish Republican Army (IRA), planted a bomb on Mountbatten's boat, the cabin cruiser Shadow V, during Mountbatten's annual summer trip to Classiebawn Castle, his house on the Mullaghmore Peninsula.

Summary text from the Wikipedia article "Assassination of Lord Mountbatten", available under CC BY-SA 4.0. Read the full article.

Where editors were working

Wikipedia editors made 15 edits to this article on 2026-08-27, concentrated in these sections. This is evidence about the surge, not an explanation of it.

• Investigation and trial
• Notes and references
• The Troubles in the late 1970s
• Warrenpoint
• Websites

What changed that day

The article grew by 638 characters that day. The largest single addition was 527 characters to Notes and references. See everything that changed on 2026-08-27 in Wikipedia's own diff view — that is where the reason for a surge is usually visible, written and sourced by the editors who were following the story.

How this was measured

Views are Wikimedia's own pageview counts for en.wikipedia, filtered to agent=user so automated traffic is excluded. The baseline is the median of the previous 60 days, which is used instead of the mean so that an earlier surge cannot flatten a later one. The multiple is the day's views divided by that median.