N-S 47 Jaroslav, Military fortification in Polom, Czech Republic.

N-S 47 Jaroslav is a standalone, double-sided, two-wing infantry casemate built in 1938 to the III degree of resistance, with two above-ground floors and one underground floor. Its main weapons were the 4 cm cannon vz. 36 paired with a heavy machine gun vz. 37 and twin heavy machine guns in both casemates, plus four light machine guns and two heavy machine guns in armored bells. The embrasures for the main weapons were removed, but most partitions on the lower floor survive.

This fortification was built in summer 1938 as part of the Czechoslovak defense line just before the Munich Agreement changed the region. It was designed to hold 37 soldiers and served as a defensive position during that critical political moment.

On the rear wall, the garrison wrote "AŤ ŽIJE Č.S.R.!" — "Long live the Czechoslovak Republic!" — during the September 1938 mobilization. The painted slogan survives as a direct trace of the men who manned the bunker in the days before the Munich Agreement.

The bunker sits between Polom and Sedloňov villages and is accessible by walking paths. Wear sturdy shoes since the routes are hilly and lead to the entrance through natural terrain.

The bunker's design was reused for the infantry casemate MJ-S 29 near Mikulov, the only object of construction subsection 3./XI. Mikulov, cast in September 1938. The OMS septic tank sits under the right bell shaft, an atypical placement for Roman resistance. The club's exhibition was later abandoned; by January 2022 the bunker was empty and freely accessible.