Reference

The significant event that happened during the 1902 Ashes series at Old Trafford was Victor Trumper's incredible century before lunch on the first day of the fourth Test. This remarkable innings is still remembered as one of the greatest in cricket history.

According to Wisden, "On the first morning of the Old Trafford Test of 1902, Victor Trumper unleashed a fierce counter-attack on Wilfred Rhodes, Bill Lockwood, and John Gunn, scoring 104 before lunch, an innings that would be remembered for generations to come." (Source: How Victor Trumper became immortal in a single session - Wisden)

Trumper's century was scored on a wet pitch, which made batting extremely challenging. His innings was a testament to his exceptional skill and bravery as a batsman. This innings is often cited as one of the greatest in Ashes history, and it has been immortalized in cricket folklore.

Here's a photo of Victor Trumper in action:

Image: Victor Trumper batting, circa 1902

If you're interested in learning more about the 1902 Ashes series, I recommend checking out the scorecard of the fourth Test at Old Trafford, which can be found on ESPNcricinfo. (Source: ENG vs AUS Cricket Scorecard, 4th Test at Manchester, July 24 - 26, 1902)

I hope this answers your question!