History

The Siege of Tyre: How Alexander the Great Built a Bridge Through the Sea

📅March 11, 2026 at 1:00 AM

📚What You Will Learn

  • How Alexander engineered a sea bridge against fierce resistance.
  • Tactics that turned naval weakness into dominance.
  • The human cost and strategic impact of the siege.
  • Why Tyre's fall reshaped ancient warfare.

📝Summary

In 332 BCE, Alexander the Great faced an impregnable island fortress at Tyre and built a massive causeway across the sea to conquer it after a grueling seven-month siege.Source 1Source 6 This engineering marvel turned the tide, showcasing his ingenuity and resolve.Source 2 The victory solidified his path to Persia, but came at a brutal cost.Source 5

ℹī¸Quick Facts

  • Causeway was ~60m wide and up to 1km long, visible today as a sandbar linking Tyre to mainland.Source 2Source 6
  • Alexander amassed 220+ ships to outmatch Tyrian navy.Source 1Source 5
  • Siege lasted 7 months; most Tyrian men killed, survivors enslaved.Source 5Source 6

💡Key Takeaways

  • Alexander's causeway exploited a natural sandbar, blending engineering with geography.Source 2
  • Naval buildup from allies like Cyprus was crucial to blockade Tyre.Source 1
  • Persistence overcame setbacks like diver attacks and deep water.Source 6
  • Demonstrated adaptability: from rubble causeway to siege towers and chains.Source 1Source 5
  • Victory enabled Mediterranean control, key to Persian campaign.Source 5
1

Tyre, a Phoenician island stronghold off modern Lebanon, defied Alexander in January 332 BCE. He sought to sacrifice to Heracles (local Melqart) in the fortified new city, but Tyrians offered only the defenseless old mainland Tyre.Source 1Source 5

This refusal blocked his Persian campaign supply lines. Alexander seized old Tyre and began rubble-powered causeway construction across shallow waters.Source 1Source 6

Initial progress was swift, but deepening seas and Tyrian fire ships halted work.Source 1

2

Workers built a 200-foot-wide (60m) mole using stones, timbers, and debris on a natural 2m-deep sandbar.Source 2Source 4Source 6

Tyrians countered with catapults, burning ships, and divers cutting anchors. Alexander innovated: armored ships, iron chains, cranes to clear boulders.Source 1Source 6

Siege towers 50m tall brought artillery to walls; morale sagged but resolve held.Source 3Source 6

The structure endures today, linking island to mainland.Source 2

3

Alexander pivoted, amassing 220 ships from Sidon, Cyprus, Rhodes, and more to blockade harbors.Source 1Source 5

His fleet outnumbered Tyre's; rams breached walls after chain fixes foiled divers.Source 6

After three days, elite troops stormed breaches amid multi-front assaults. Alexander led from a tower as hypaspists poured in.Source 1Source 6

4

City fell after seven months; streets ran with blood as Macedonians avenged causeway deaths.Source 5Source 6

8,000 Tyrians slain, 2,000 crucified; 30,000 enslaved. Alexander razed parts, fortifying the mole.Source 2Source 5

This triumph opened sea routes, proving engineering could conquer 'impossible' defenses.Source 1

5

Tyre's siege, Alexander's toughest of 20, highlighted adaptability over brute force.Source 5

It inspired awe: a bridge through the sea symbolized his genius.Source 4

Modern studies confirm sandbar aided the feat, blending nature and ambition.Source 2

⚠ī¸Things to Note

  • Tyrians refused sacrifice in new Tyre, sparking siege over old mainland site.Source 1
  • Macedonian morale dipped during tough causeway build.Source 3
  • Alexander personally led final assault from a siege tower.Source 6
  • Causeway strengthened with city rubble post-conquest.Source 2
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