1915 25th April
AE2 Ordered to Disrupt Ottoman Reinforcements
Stoker receives instructions to enter the Sea of Marmara and attack Ottoman communications.
First World War · Gallipoli · permanent subject timeline
Sea of Marmara Operations
Naval activity beyond the Dardanelles narrows. This page combines historical context with 7 matching records drawn directly from the World History Database Gallipoli archive.
Historical context
Sea of Marmara Operations: overview and significance
What happened?
Allied submarines that penetrated the straits attacked Ottoman transport and warships in the Sea of Marmara. The operations sought to disrupt supply routes supporting Ottoman forces.
Why was it important?
These missions demonstrated that the Dardanelles could be penetrated by small underwater craft even when the surface fleet could not force the passage.
World History Database records
Sea of Marmara Operations timeline
The records below are selected from the 319-record Gallipoli archive and rendered as static HTML in chronological order.
1915
1915 25th April
AE2 Reaches Sea of Marmara
Stoker succeeds in taking AE2 through the Dardanelles into the Sea of Marmara.
1915 27th April
E14 Enters Dardanelles Minefields
Boyle takes submarine E14 beneath the Dardanelles minefields toward the Sea of Marmara.
1915 18th May
E11 Dardanelles Passage Begins
Nasmith takes E11 through the heavily defended Dardanelles toward the Sea of Marmara.
1915 18th May
E14 First Marmara Patrol Completed
Boyle returns through the Dardanelles after a successful first patrol in the Sea of Marmara.
1915 23rd May
E11 Ottoman Gunboat Destroyed
Nasmith attacks a patrol vessel during E11's first offensive sweep beyond the Dardanelles.
1915 November
Third E11 Marmara Patrol Conducted
Nasmith conducts a third patrol against Ottoman shipping before the Gallipoli campaign ends.
Editorial provenance
Sources and editorial review
Compiled and edited by World History Database.
Historical context is editorial material; the chronology is generated from World History Database Gallipoli and Dardanelles records.
Last reviewed: September 2026.
Continue exploring