user
Instruction
Answer the question based on the provided table.


Table
Table Title: 'Ships attacked' regarding 'Gerhard Bigalk'
Table Content:
| Date | Name | Nationality | Tonnage (GRT) | Fate |
| --- | --- | --- | --- | --- |
| 14 June 1941 | St. Lindsay | United Kingdom | 5,370 | Sunk |
| 21 December 1941 | HMS Audacity | Royal Navy | 11,000 | Sunk |
| 2 February 1942 | Corilla | Netherlands | 8,096 | Damaged |
| 4 February 1942 | Silveray | United Kingdom | 4,535 | Sunk |
| 7 February 1942 | Empire Sun | United Kingdom | 6,952 | Sunk |
| 16 May 1942 | Nicarao | United States | 1,445 | Sunk |
| 19 May 1942 | Isabela | United States | 3,110 | Sunk |


Question
What happened to the two heaviest ships Gerhard Bigalk attacked?


Answer Format
The final answer should be a sentence and use the following format:
```json
{
    "answer": "your_generated_sentence_here"
}
```
rule
["Gerhard Bigalk damaged one ship of 8,096 GRT, and sunk one warship of 11,000 tons."]