Poland mistakenly invaded the Czech Republic and kept army presence there in late May until the mistake was discovered and the soldiers were called back to Poland proper, CNN reported on Friday.

The Polish Republic closed its borders to protect its public from the spread of the coronavirus and, to ensure that nobody entered the country, the army was sent to Pielgrzymow.

Due to both nations being EU member countries, the border is not clearly marked and it is possible the soldiers simply mistook their grounds as part of Poland when it was, in fact, a foreign country.

Surprised Czech citizens were told they could not visit a local church, which the soldiers thought was on the Polish side, when in fact the church and the church-goers were in the Czech Republic the entire time.

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When the Czech Embassy in Poland was informed of the news it reached out to the Polish government which quickly instructed the army to depart from there.

The Czech foreign ministry said Poland has not formally explained the error but had “unofficially assured us that this incident was merely a misunderstanding caused by the Polish military with no hostile intention”.

Poland’s ministry of defense said in a statement: “The placement of the border post was a result of a misunderstanding, not a deliberate act. It was corrected immediately and the case was resolved – also by the Czech side.”