The Pride of the English Navy
When it was commissioned in 1511, the English ship Mary Rose was at forefront of naval technological development. It was among the earliest vessels that relied on cannons that fired not from the top deck as had been the norm since guns were introduced to ships, but from portholes cut into the hull on lower decks. As such, she was among the pioneering ships that revolutionized naval warfare. Such vessels helped usher in the transition from thousands of years of naval combat in which ships rammed each other, and sailors grappled and boarded enemy vessels. Now, ships would fight each other with massed gun broadsides.
The Mary Rose was a success, and gave the Royal Navy decades of solid service. Then in 1536, she underwent an unfortunate redesign and upgrade. The idea behind the upgrade seems to have boiled down to “cannons are good, so more cannons are better“. It was not bad logic, in of itself. However, it turned out to be a major blunder in this particular case. More cannons were added to a ship that had not been specifically designed to accommodate more cannons and bear their additional weight.