C.A.S.
| Name | C.A.S. |
| Type | Fishing vessel (smack) |
| GRT | 60 tons |
| Country |  British |
| Built | 1914 |
| Builder | ?, Rye |
| Operator | William J. Williams, Lowestoft |
| History | Fishing registration: LT 51 |
U-boat attacks on Fishing vessel (smack) C.A.S.
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 12 Mar 1917 | UC 47 (Paul Hundius) | Sunk | Stopped and scuttled 12 miles NNW of Trevose head | 50° 46'N, 5° 10'W | 0 | ||
| or 56 grt | ||||||||
Position of attack on C.A.S.
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