If DTaP #4 is given with at least a 4-month interval after DTaP #3, it does not need to be repeated. The minimum age of 12 months for the fourth dose must be met. Decreasing the interval to less than 6 months, however, is not recommended.
The total given by the VA for the Indian Wars (1,000) seems to be a wild guess. Just two major defeats -- Custer's and St. Clair's -- add up to about 900 dead all by themselves. The official number of Americans killed in the Revolutionary War (4,435) is only about 2/3 the numbers usually given by historians. The total of US combat deaths during the Civil War is given as 140,414 -- or some 30,000 higher than most historians would estimate. I suspect (but don't know for sure) that the boost may come from the DoD counting deaths among POWs as combat rather than disease.
British casualties amounted to 68,000, while French losses totalled around 290,000 with many more than that either missing or taken prisoner. German casualties, on the other hand, amounted to 27,074 killed and 111,034 wounded. The statistics tell the story.