Parade of the 3rd Elizavetgradsky Hussar Regiment in Peterhof. The honorary colonel-in-chief Olga Nikolaevna of Russia on horseback with her regiment, postcard by Underwood &amp; Underwood.
<bdi><a href="https://en.wikipedia.org/wiki/en:Underwood_%26_Underwood" class="extiw" title="w:en:Underwood &amp; Underwood"><span title="American photo studio and photo agency">Underwood &amp; Underwood</span></a>
</bdi>
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