Sarah Aaronsohn
In September 1917 the Ottomans caught one of her carrier pigeons which they then worked out (decrypted) and found out where she was. After arresting lots of people, the Ottomans tortured Sarah Aaronsohn for four days before she managed to find a gun to shoot herself with. In her last written letter she said that she hopes her activities with Nili would help bring the Jews a home country.