[3] When the Germans retreated from Joniškėlis in December 1918, the county committee instructed officer Kazilionis to organize a militia.

[1] On April 5, a defence staff was formed, which intended to coordinate the actions of the different militia units.

[1][4][5] In the beginning of June, the battalion moved to Panevėžys, where it was strengthened by new recruits and so lost its partisan character.

[1] On June 20, it was reorganised as the Joniškėlis Battalion (Lithuanian: Joniškėlio batalionas) and Aleksandras Jakaitis [lt] was made its commander.

[5] In December 1919, when the 9th Infantry Regiment took over the front against the Polish Army several clashes took place in the vicinity of Turmantas railway station.

[1] On October 9, under attack and under threat of encirclement by Żeligowski's troops, the two battalions retreated to the line Bajorai [lt]-Didžioji Riešė.

[3] On October 21, after a breakthrough by the Polish cavalry towards Širvintos, the 9th Infantry Regiment retreated to the other side of Neris river through Kernavė.

[7] After active combat ended, the unit was concentrated in Utena and departed to Žasliai district on December 5.

[5] On 22 September 1929, the regiment was presented with a flag with the inscription: "Amžiais už Vilnių dės galvą lietuvis" (The Lithuanian will lay down his head for Vilnius for ages).