Instruct: Retrieve semantically similar text.
Query: Algirdas (Belarusian: Альгерд , Russian: Ольгерд , Polish: "Olgierd" ;  1296  – May 1377) was a ruler of medieval Lithuania. He ruled the Lithuanians and Ruthenians from 1345 to 1377. With the help of his brother Kęstutis (who defended the western border of the Duchy) he created an empire stretching from the present Baltic states to the Black Sea and to within fifty miles of Moscow.
Olgierd is the polish name for algirdas
algirdas was a brother of kestutis
Maybe there is an expansion.
Them refers to a country that is now an ally
The country has been divided into two
The situation is fluid
Estonia is mentioned in the statement
The district is a bit old
This was arranged many years ago
Russia was almost involved in the conflict. 
two divisions were ready
The operation is ongoing
There is some action goings on.
it was established with assistance
Poland is close to Germany
the border is well guarded
Its a good idea to keep some distance
We do have something remotely like that in this situation.
Baar has people on it.
More than two division were ready
there was a primordial explosion
An example is russia
Ольгерд is both Russian and Belarusian
He was born in the 12th century.
Algirdas was an only child.