The first mention of the front crawl stroke in a competitive context was reported by The Times newspaper in 1844 from a race in London, in whichtwo native Americans, Flying Gull and Tobacco, were said to be lashing the water violently with their arms like the sails of a windmill and beating downwardly with their feet. Observers were reported to be shocked by the stroke and its difference to breaststroke, which at that time was the only competitive stroke used in European swimming clubs.
At the first modern Olympics games in Athens in 1896, the Hungarian Hajós Alfréd won the 100m and 1200m freestyle swimming events using an early but effective version of the front crawl stroke. Hajós stated that he had learnt this swimming style from the sailors of the river Danube in Budapest. The majority of freestyle swimmers at the first four Olympic Games used a hybrid style of front crawl arm technique and breaststroke leg kick, called “Trudgen stroke”, named after the English swimmer John Trudgen, who himself learnt this style while living abroad from South African natives.
At the turn of the 20th century, there was no internationally agreed front crawl swimming style. Body and head positions, type and intensity of the leg kick, coordination of the arms, as well as the amount of body roll all varied widely from country to country. In addition to the European swimming communities, the Japanese, American and Australian communities all contributed significantly to the development of the front crawl stroke. 
In the 1920s, the American Johnny Weismüller dominated the sprint freestyle swimming events with his unique front crawl technique. Interestingly, his head position was extremely high, which is now considered a disadvantage. The American won several Olympic gold medals and was the first person to swim the 100m freestyle in under a minute. After his retirement from competitive swimming, Weismüller became an actor and gained fame through his best known role as “Tarzan”.
The technical improvement of front crawl continued throughout the early 20th century and the swimming stroke started to adopt specialized forms. The international swimming community realized that there was no single way to swim front crawl efficiently. Swimmers began to adapt their swimming techniques to the chosen distance and to their physical abilities. Differences in stroke rates, frequency of kick, breathing patterns and the amount of body rotation were the main characteristics that differed between the applied swimming techniques.