The Battle of Hyvinkää was fought during the Finnish Civil War on 19-21 April 1918, when troops from the German Baltic Sea Division marching from Helsinki conquered the locality from the Reds who had held it for three months.

[2] Until the general strike of 1905, the Nurmijärvi parish was dominated by local landowner families, but with the social upheaval, the labor movement also gained influence.

[3] After the general strike of November 1917, the municipal administration of Hyvinkää gradually passed to the Reds, and power finally came into their hands by mid-February 1918.

From the German Baltic Division, the 95th Reserve Infantry Brigade, led by Major General Konrad Wolf, took part in the battle, consisting of three Jaeger battalions, reinforced by three bicycle companies and two machine gun units, as well as artillery and an armored train.

[5] The main defense stations of the Reds who defended Hyvinkää were along the Hanko railway in Hevosmäki, Hyvinkäänkylä, on the west side of which the Vantaa River flowed.

Eventually, the Reds noticed one German department advancing by road from the east of Kerava towards Järvenpää, and ended the siege to avoid retreating to Hyvinkää.

However, they had to give up their armored train even before the village of Jokela, when the Reds blew up the railway bridge over the Palojoki River.

[7] The next morning the fighting took place in Palopuro, Pengarkoski, and Noppo, during which the western department of the Germans reached Rajamäki, from where the Reds now began to evacuate their troops and family members towards Hyvinkää.

In the Pengarkoski, the Reds withdrew from the battle before noon, which opened a free road for the Germans to the Noppo station north of Rajamäki.

[7] On the morning of April 21, the German attack was launched with artillery concentration that started at 7 o'clock, targeting the Red defenses at the southern end of Hevosmäki in Åvik.

At the same time, the Germans started another siege movement when a department led by cavalry master Ehrenkrook circled from the east via the Ridasjärvi village towards Hyvinkää station.

The severity of the resistance is explained by the fact that the evacuation of Hyvinkää, which was started by the Reds immediately after the break-in Hevosmäki's defense, was still badly in progress.