Final answer:
In 1585, 25 of Sir Richard Grenville's ships went missing after severe storms during an expedition to North America. The Tiger and Elizabeth were the only ones that managed to regroup, while the remaining ships were never found and presumed destroyed by the storm.
Step-by-step explanation:
Sir Richard Grenville's fleet encountered severe storms after leaving Sicily, which led to the loss of contact with 25 of his ships, including the Roebuck, the Lion, the Elizabeth, and the Dorothy. This event occurred during an expedition to establish a permanent English settlement in North America in 1585. The Tiger, the largest ship of the fleet, managed to reach Puerto Rico, and the Elizabeth joined it later. However, despite efforts to wait and search for them, no sign of the rest of the missing ships was found, indicating that they were likely destroyed by the storms.