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
flagItaly
0%
60%
20%
20%
10
flagthe United Kingdom
11%
56%
20%
11%
53
flagPoland
12%
54%
22%
9%
2146
flagGermany
18%
51%
17%
12%
74
flagIndia
25%
50%
16%
8%
12
flagAustria
36%
45%
13%
4%
22
flagthe United States
30%
44%
14%
8%
56
flagAustralia
5%
40%
25%
20%
20
flagGreece
8%
33%
41%
16%
12