Utrio and its surrounding area had a pivotal role during the early phase of the fighting in the late summer of 1944. On a map, Utrio is the name for a collection of widely scattered farmhouses deep in almost trackless forest.
A single narrow dirt road led to the battle area from the direction of Ukkolanvaara in the northwest but ended four kilometers before Utrio, whence it continued as a track barely wider than a footpath. This compounded problems during the deployment of troops for the upcoming attack.
After the battle started, the only practical way to supply the combat forces with ammunition, equipment and provisions was to use horse-drawn travois and pack saddles. The transport of wounded soldiers for medical care proved to be the biggest logistical challenge.
Major General Erkki Raappana’s plan was to separate the Red Army’s 289th and 176th divisions, which were pushing toward Ilomantsi, from each other and cut off their supply lines. The enemy formations would then be reduced, encircled, and finally destroyed. The plan verged on recklessness and required a clear numerical superiority to succeed.
The attack would be aimed at the junction of the enemy divisions.
Military strategists have traditionally regarded a seam between units and formations as the most vulnerable section of a battlefront, regardless of the size of the forces involved.
A task force under the command of Colonel Hans Olof von Essen was formed for the operation. The core of this formation was the commander's cavalry regiment. Fighting began early in the morning on July 31 when Essen’s men supported by the 1st Jaeger Battalion punched a narrow wedge through the isthmus that separates Lake Ilajanjärvi and Lake Luovejärvi.
The attack of the 6th Jaeger Battalion from Teponlampi was delayed by 24 hours, but this had no significant effect on the situation. Once the battalion got moving, it drove toward the area south of Luovejärvi to cover the flank of the 21st Brigade, which had seen action around Möhkö.
After 24 hours of fighting, Essen's force had advanced sufficiently to split for envelopment. The enveloping forces eventually linked up as planned, which meant that Raappana’s design had succeeded. The next step was to encircle the trapped enemy forces