#TwelveDayWar is the hashtag for the 12-day armed conflict between Israel and Iran that ran from June 13 to June 24, 2025 — a war that began with an Israeli surprise strike on Iran’s nuclear and military infrastructure and senior military leadership, escalated into a mass ballistic-missile and drone barrage from Iran, drew the United States into direct combat with bunker-buster strikes on Natanz, Fordow, and Isfahan on June 22, and ended in a U.S.-brokered ceasefire that Donald Trump himself named the “12 day war” when he announced it on June 23. It marked the first direct, open state-on-state warfare between Israel and Iran after 45 years of proxy conflict, and its ceasefire framework became the reference point for the more restrictive 2026 U.S.-Iran deal a year later.
Quick Facts
- Duration: June 13 – June 24, 2025 (12 days)
- Belligerents: Israel and the United States vs. Iran
- Casus belli: Israeli surprise strike on Iranian nuclear and military facilities and personnel
- Peak U.S. involvement: June 22 — B-2 bomber strikes with GBU-57 “bunker busters” on Natanz, Fordow, and Isfahan enrichment/research sites
- Ceasefire: brokered by the U.S. and Qatar, announced June 23 by Trump; took effect June 24
- Casualties (as of June 28, 2025): ~1,190 killed in Iran; 28 civilians + 1 off-duty soldier killed in Israel; thousands wounded on both sides
- Naming: Trump’s ceasefire announcement first used the term “12 day war”
Origin
The war opened on June 13, 2025 when Israel launched a coordinated surprise attack on Iran. More than 200 Israeli fighter jets struck more than 100 nuclear and military targets across the country, hit residential neighbourhoods, damaged or destroyed layers of Iranian air defence, and killed senior Iranian military commanders, nuclear scientists, and politicians. Israeli officials framed the strikes as a pre-emptive move against what they described as an advancing Iranian nuclear-weapons program.
Timeline
Days 1–3 — Israel opens the war
Israel executes its surprise campaign against Iranian nuclear and military infrastructure and leadership. Iran begins its response with ballistic-missile and drone launches at Israeli civilian and military sites.
Days 4–8 — Escalating exchange
Iran fires waves of ballistic missiles and Shahed-style drones at Israel, ultimately totalling more than 550 ballistic missiles and over 1,000 drones by the end of the war. Israeli air-defence networks intercept a large share of incoming projectiles but civilian population centres, at least one hospital, and roughly a dozen military, energy, and government sites are struck.
Day 9 — U.S. bunker-busters
On June 22, U.S. B-2 stealth bombers strike Iran’s Natanz, Fordow, and Isfahan nuclear facilities with GBU-57 Massive Ordnance Penetrator “bunker-buster” bombs. Iran launches missiles at the largest U.S. airbase in the Middle East, in Qatar.
Days 10–12 — Ceasefire
The U.S. and Qatar broker a ceasefire. On June 23, Trump announces the deal on Truth Social and uses the phrase “12 day war.” The ceasefire takes effect on June 24, initially violated by both sides in the first hours but ultimately holding.
Casualties
The Twelve-Day War produced the heaviest Iran–Israel casualty figures in the history of their conflict. Human Rights Activists in Iran reported that by June 28, 2025, Israeli strikes had killed roughly 1,190 people inside Iran — including 436 civilians, 435 military personnel, and 319 unclassified — and wounded more than 4,000. Israeli official figures reported 28 Israeli civilians and one off-duty soldier killed, and 3,238 hospitalised injuries from Iranian strikes.
Aftermath
The June 24 ceasefire held through the second half of 2025, but the underlying conflict was not resolved. On February 28, 2026, the United States and Israel launched fresh strikes on Iran, opening the separate “2026 Iran war.” That conflict was in turn paused by the #IranCeasefire2026 Memorandum of Understanding signed at the Palace of Versailles on June 17, 2026, whose framework was explicitly built on lessons from — and criticism of — the 2025 Twelve-Day War arrangement.
Cultural Impact
The Twelve-Day War changed how open-warfare imagery flowed through mainstream feeds: for the first time viewers could compare, side by side, live Israeli interception clips over Tel Aviv and open-source-verified damage assessments from inside Iran. It also fixed a shorthand into the political vocabulary — “the 12-day war” — that continued to be used in every subsequent round of Iran diplomacy and Israeli political debate. Trump’s use of the name in his ceasefire announcement gave the war its own hashtag before the fighting stopped.
Sources
- https://en.wikipedia.org/wiki/2025_Israel-Iran_war
- https://en.wikipedia.org/wiki/Twelve-Day_War_ceasefire
- https://en.wikipedia.org/wiki/Casualties_of_the_Twelve-Day_War
- https://www.britannica.com/event/12-Day-War
- https://www.aljazeera.com/news/2025/6/26/visualising-12-days-of-the-israel-iran-conflict
- https://en.wikipedia.org/wiki/Reactions_to_the_Twelve-Day_War