 The club won promotion to the First Division in their second season , and yo @-@ yoed between the First and Second Divisions in their early years . They reached the 1915 FA Cup Final , where they lost to Sheffield United at Old Trafford , and finished third in the First Division in 1920 , the club 's best league campaign to that point . Chelsea attracted large crowds and had a reputation for signing big @-@ name players , but success continued to elude the club in the inter @-@ war years . 
