Invasion of Yugoslavia
1941 German-led attack on the Kingdom of Yugoslavia by the Axis powers during the Second World War
The invasion of Yugoslavia, also known as the April War or Operation 25, was a German-led attack on the Kingdom of Yugoslavia by the Axis powers which began on 6 April 1941 during World War II. The order for the invasion was put forward in "Führer Directive No. 25", which Adolf Hitler issued on 27 March 1941, following a Yugoslav coup d'état that overthrew the pro-Axis government.
The invasion commenced with an overwhelming air attack on Belgrade and facilities of the Royal Yugoslav Air Force (VVKJ) by the Luftwaffe (German Air Force) and attacks by German land forces from southwestern Bulgaria. These attacks were followed by German thrusts from Romania, Hungary and the Ostmark (modern-day Austria, then part of Germany). Italian forces were limited to air and artillery attacks until 11 April, when the Italian Army attacked towards Ljubljana (in modern-day Slovenia) and through Istria and Lika and down the Dalmatian coast. On the same day, Hungarian forces entered Yugoslav Bačka and Baranya, but like the Italians they faced practically light resistance. Italians moved into Dalmatia also from Italian-controlled Albania, after repelling an initial Yugoslav attack there.
Scholars have proposed several theories to explain the sudden collapse of the Royal Yugoslav forces, including poor training and equipment, generals eager to secure a quick cessation of hostilities, and fifth column activities by groups of Croatians, Slovenians, and ethnic Germans. The latter has been questioned by scholars who have suggested that the fifth column had little effect on the ultimate outcome. The invasion ended when an armistice was signed on 17 April 1941, based on the unconditional surrender of the Yugoslav army, which came into effect at noon on 18 April.
This brief starts where responsible research should: with the source description of “Invasion of Yugoslavia” as 1941 German-led attack on the Kingdom of Yugoslavia by the Axis powers during the Second World War. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the history & society register because the source frames it as 1941 German-led attack on the Kingdom of Yugoslavia by the Axis powers during the Second World War. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Contemporary correspondence, administrative files and participant testimony can test how later narratives organized the event or institution. The source revision retrieved here is dated Sep 21, 2026. The linked authority identifier is Q697842. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1941.
Later summaries often reconcile disputed chronology or motive more neatly than the contemporary record permits. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Compare institutional narratives with records created by participants and affected communities. Dates and formal titles are useful anchors, but not substitutes for context.
- Event chronology
- Institutional context
- Locating named record creators
Contemporary correspondence, government or organizational records, oral histories and cited historical scholarship.
Three-step research path
- Establish the record: confirm the title “Invasion of Yugoslavia”, its source revision and the description used here.
- Expand the search: follow Invasion of Yugoslavia primary sources, Invasion of Yugoslavia archive and Invasion research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Invasion of Yugoslavia”?
- What chronology connects this entry to wider political or social change?
- Who created the surviving record, and for what administrative purpose?
Search terms from this dossier
This entry incorporates text from “Invasion of Yugoslavia” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.