This may be his marriage, the names are right-ish and the area is possible:

Name Peter Luke Dore
Spouse's Name Maria Ward
Event Date 15 Mar 1820
Event Place Ghazeepore, Bengal, India
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In the scan of the marriage register it says (none too clearly):

35 Peter Luke Dore, Lieutenant in 1st Bn the @4th Regt of Foot, Bachelor and Maria Ward (superimposed over a crossed out word) also of this station, spinster were married in the house of George Wilson Esqre at Ghazeepore by Licence this 15th day of March in the year 1820 By me   William Palmer [Chaplain in other register entries].
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From FIBIS he arrived in India in 1814:

Entry from Arrivals from The Bengal and Calcutta Directories 1812 -1814, 1816
Arrivals   Arrival    
Month & Day   Oct    
Year   1814    
Ship   Bengal    
Type   HC Ship    
Captain   Nichols    
Title or Rank   Ensign    
Forenames   Peter Luke    
Name   Dore    
Regiment or Occupation   HM 24th Regt. Foot    
Passenger Origin   England    
Passenger Destination   Calcutta    
Vessel Origin   England    
Vessel Destination   Calcutta    
Source   Bengal Directory    
Edition   1815    
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This may have been his death:

Surname   First name(s)   Age   District   Vol  Page
Deaths Mar 1855   (>99%)
Dore Peter Luke    Portsea 2b 351
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