He spent 30 days in an Austrian Army prison as a result, and an injury from the engagement left a scar on his head.

He graduated from military school in Saint-Maixent-l'École one year later, and was promoted to second lieutenant and transferred to the 1st Regiment of Algerian Gunners.

On 25 September 1911 he transferred to the 4th Regiment of Algerian Gunners, and began a military expedition in Morocco the following June, a couple of weeks after he was married.

He transferred to 4th Regiment of the Colonial Infantry on 15 April 1913, and was sent for recuperative leave to Tunisia in July of that year.

He first reached the German-French frontline as a secondary troop commander on 2 August 1914, and was wounded in the First Battle of the Aisne on 21 September, earning a promotion to captain and a citation in the army report for bravery.

On 31 January, while Šnejdárek's troops were preparing for a battle at Skoczów, the Czechoslovak Minister of Defence called off the hostilities, and the war ended.

His troops began their offensive against the Hungarian Bolsheviks on 10 June, and three days later won an engagement in Zvolen.

On 17 September 1919 he was appointed commander of the Prague garrison, and on 30 December he was part of a French Army mission in Czechoslovakia.

In September 1933 he received annual evaluation beyond praise from chief staff officer general Jan Syrový, but the following year his evaluation from new chief staff officer General Krejčí was negative, and Krejčí began to put pressure on Šnejdárek to retire.

He was still living in Bratislava on the establishment of the Slovak Fascist State on 14 March 1939, and two weeks later he was removed from his position as commander of the National Gunners Guards.