<a href="https://en.wikipedia.org/wiki/World_War_II" id="mw4w" rel="mw:WikiLink" title="World War II">World War II</a>: First German military units enter Bulgaria <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Military_history_of_Bulgaria_during_World_War_II" id="mw5A" rel="mw:WikiLink" title="Military history of Bulgaria during World War II">after it joins the Axis Pact</a>.