[4][5][6] Baumruk took part in the first international game involving a Czech team, turning out for a Prague XI against Berlin on 8 January 1899.

[7] A hat-trick against Union Vienna was Baumruk's best performance of 1900 and this result meant that Slavia hit double digits for the fourth time that season.

Throughout the 1903 campaign, Baumruk again proved that he was one of the best right-wingers in continental Europe scoring 24 goals and assisting on 31 occasions.

[13][14] In November of 1904, Baumruk, Jan Košek and Rudolf Krummer headed to Sparta Prague for a year.

Jindřich Baumruk, still in his seventies, remembered the beginnings of football in Prague, "On Vinohradská Kanálka, a flat plot in the place of today's Riegrový Sady, where students from both Vinohrady secondary schools - from the gymnasium in Hálková street and from the Na Smetánce school used to gather to play football.