Early years In 1914–15 Jacobs played in the Leinster Junior League alongside
Shamrock Rovers and in 1916–17 they were runners up in the
IFA Junior Cup, losing in the final to a team representing the
Royal Irish Rifles. During the 1919–20 season, played against the background of the
Irish War of Independence, a group of Jacobs players were found guilty of invading the dressing room of their opponents,
Olympia, after a
Leinster Senior Cup game. Two Jacobs players received lengthy suspensions from the
Leinster Football Association as did an Olympia player when it emerged that Jacobs had been taunted for "playing (
British Army) soldiers" in their team.
League of Ireland In
1921–22, together with
Shelbourne,
Bohemians,
St James's Gate,
Frankfort,
Olympia,
YMCA and
Dublin United, Jacobs became founder members of the
League of Ireland. Like Jacobs, the other seven founding members had spent the 1920–21 season playing in the
Leinster Senior League. In the 1921–22
Leinster Senior Cup Jacobs were finalists, losing 1–0 to eventual treble winners, St James's Gate. The highlight of their time in the League of Ireland was a third-place finish in
1923–24. They were also
FAI Cup semi-finalists in
1922–23 and
1925–26. After finishing bottom of the table three consecutive seasons, Jacobs failed to gain re-election at the end of the
1931–32. Together with
Brideville they left the league which was reduced from twelve to ten clubs.
Leinster Senior League After leaving the
League of Ireland, Jacobs rejoined the
Leinster Senior League. During the 1950s they enjoyed something of a revival. In 1949–50 they won the
FAI Intermediate Cup after beating
St Patrick's Athletic in the final. They were also runners up in this cup competition in 1952–53, 1953–54 and 1960–61. Between 1952–53 and 1954–55 they were Leinster Senior League champions on three consecutive seasons. In 1967–68 they won a fourth Leinster Senior League title. ==Honours==