Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Fortress of Suomenlinna' has mentioned 'Naval base' in the following places:
Occurrence Sentence Text Source
In the approach to it he built the fortified naval base of Kronstadt.
The main Swedish naval base at Karlskrona was too far to the south to meet Sweden's new needs for its navy in the 18th century, which often resulted in Swedish ships reaching the coast of Finland only after Russian ships and troops had either started or completed their spring campaigns.
After lengthy debate, the Swedish parliament decided in 1747 to both fortify the Russian frontier and establish a naval base at Helsingfors as a counter to Kronstadt.
Ehrensvxc3xa4rd's plan contained two fortifications: a sea fortress at Svartholm near the small town of Lovisa,[4] and a larger sea fortress and naval base (Sveaborg) at Helsingfors.