When was the first successful human torpedo attack launched?

in 1863
in 1918
in 1941
in 1943
Although the term human torpedo is usually associated with Japan during the WW II, it was actually developed much earlier. On 1 November 1918, an Italian manned torpedo nicknamed Mignatta sank the Austrian battleship Viribus Unitis and the freighter Wien using limpet mines. It was the first successful attack of its kind.
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Answers by country

in 1863
in 1918
in 1941
in 1943
answers
flagPoland
12%
54%
22%
9%
1753
flagIndia
18%
54%
18%
9%
11
flagthe United Kingdom
10%
51%
25%
12%
39
flagAustralia
7%
50%
14%
14%
14
flagthe United States
31%
47%
11%
6%
44
flagGermany
21%
47%
19%
11%
42
flagAustria
41%
47%
11%
0%
17