Cecil Scott Forester's Horatio Hornblower Novels:
(Order based on the setting of the novels, not the order in which they were written)

01 - Mr Midshipman Hornblower(1950)
Set in: June 1794 - April 1798

02 - Lieutenant Hornblower (1952)
May 1800 - April 1803

04 - Hornblower and the Atropos (1953)
December 1805 - January 1808

05 - The Happy Return (1937)
(US title: Beat To Quarters)
June 1808 - October 1808

06 - Ship of the Line (1938)
May 1810 - October 1810

07 - Flying Colours (1938)
November 1810 - June 1811

08 - The Commodore (1945)
(US title: Commodore Hornblower)
May 1812 - October 1812

09 - Lord Hornblower (1946)
October 1813 - May 1814

10 - Hornblower in the West Indies (1958)
(US title: Admiral Hornblower in the West Indies)
May 1821 - October 1823

Others:

The hand of destiny (1940) (Don't have)
Shortstory

Hornblower and his majesty (1941) (Don't have)
Shortstory

The point and the edge (1964)
Shortstory
1819

Hornblower and the widow McCool (1966)
(US title: Hornblowers temptation)
Shortstory
@ 1799 - 1800

The last encounter (1966)
Shortstory
After 1823

Hornblower and the Crisis (1967)
(US title: Hornblower During the Crisis)
Unfinished novel.
July 1805 -