17. In relation to this argument, the Court was referred to a large number of decisions in this country, the United Kingdom, New Zealand, Canada and the United States of America. The wording of the critical requirement involved in those cases varied considerably. In some cases, it was a requirement, in Workmen's Compensation legislation, that the injury be "by accident" (see, e.g., Fenton v. Thorley & Co., Limited (1903) AC 443; Clover, Clayton & Co., Limited v. Hughes (1910) AC 242). In some, it was the requirement in an insurance policy that the injury or damage be "accidental" (see, e.g., Mount Albert City Council v. New Zealand Municipalities Co-operative Insurance Co. Ltd. (1983) NZLR 190). In others, it was the notoriously obscure requirement (see Lord Cozens-Hardy M.R. in In re United London and Scottish Insurance Company, Limited. Brown's Claim. (1915) 2 Ch 167, at p 170) that the injury be the result of or caused by "violent, accidental, external and visible means" (see, e.g., Clidero v. Scottish Accident Insurance Co., Limited (1892) 19 R. (Ct. of Sess.) 355; Hamlyn v. Crown Accidental Insurance Company, Limited (1893) 1 QB 750; In re Scarr and General Accident Assurance Corporation, Limited (1905) 1 KB 387; Steinke v. Australian Provincial Assurance Association Ltd. (1944) St.R.Qd. 7; Dennis v. City Mutual Life Assurance Society Ltd. [1979] VicRp 9; (1979) VR 75; Cotton v. Phoenix Assurance Company of Australia Ltd. (1982) 2 ANZ Insurance Cases 60-522; National & General Insurance Co. Ltd. v. Chick (1984) 2 NSWLR 86; Federation Insurance Ltd. v. R. Banks [1984] VicRp 42; (1984) VR 525). In others, the requirement was framed in words similar to, or the same as, the requirement of the policy in the present case (see, e.g., Martin v. The Travellers' Insurance Company (1859) 1 F & F 505 (175 ER 828); Columbia Cellulose Co. Ltd. v. Continental Casualty Co. (1963) 40 DLR (2d) 297; affirmed (1964) 42 DLR (2d) 401; Smith v. British Pacific Life Insurance Co. (1965) SCR 434; A.F. & G. Robinson v. Evans Bros. Pty. Ltd. [1969] VicRp 110; (1969) VR 885; Lipertis v. Australian Casualty Co. Pty. Ltd. (1983) 2 VR 280). The judgments in the abovementioned cases and in other cases to which the Court was referred or which are cited in the standard textbooks on insurance law, contain helpful and instructive discussions about the scope of the particular requirement that was relevant for the purposes of the particular case. Some of those cases provide support for Australian Casualty's argument (see, in particular, In re Scarr and General Accident Assurance Corporation, Limited; Columbia Cellulose Co. Ltd. v. Continental Casualty Co; Smith v. British Pacific Life Insurance Co.; the judgments of Kaye J. in Dennis v. City Mutual Life Assurance Society Ltd. and in Federation Insurance Ltd. v. R. Banks). Others militate against that argument and, in our view, support the conclusion reached hereunder (see Martin v. The Travellers' Insurance Company; Hamlyn v. Crown Accidental Insurance Company Limited, at pp 753, 754; Fenton v. Thorley & Co, Limited, at pp 448-450, 452, 453; Clover, Clayton & Co., Limited v. Hughes, at pp 246, 249, 255-256; A.F. & G. Robinson v. Evans Bros.; the judgments of Starke J. and Brooking J. in Federation Insurance Ltd. v. R. Banks; United States Mutual Accident Association v. Barry [1889] USSC 168; (1889) 131 US 100, at pp 121-122 (33 Law Ed 60, at p 67)). It is, however, unnecessary that we embark upon a detailed analysis of the decisions or judgments in those cases. It suffices that we acknowledge the assistance which we have derived from them and turn at once to a consideration of what we see as being, for present purposes, the critical step in Australian Casualty's argument.