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Clue. Callousness ????B???D?F???S
Clue. 2 Large heavy boots ????H???E?E
Clue. 3 Candid or forthright ??????H?N
Clue 4 English general sucessful at the war
of the Spanish sucession
Two words ???? ??????I?l
T hanks for any help. Rufina

You've got some letters wrong.

2 is CLODHOPPERS

4 is JOHN CHURCHILL, 1st Duke of Marlborough

How do the wrong letters in the first one affect the others?

With more wrong letters, 3 is probably OUTSPOKEN

... and finally, 1 is probably INSENSITIVENESS

With a different "wrong letter", no.1 could be "coldbloodedness".

Yes, that's probably closer than my answer as it only needs one wrong letter.