Critics of Pericles' strategy, however, have been just as numerous as its supporters. A common criticism is that Pericles was always a better politician and orator than strategist. Donald Kagan called the Periclean strategy "a form of wishful thinking that failed", Barry S. Strauss and Josiah Ober have stated that "as strategist he was a failure and deserves a share of the blame for Athens' great defeat", and Victor Davis Hanson believes that Pericles had not worked out a clear strategy for an effective offensive action that could possibly force Thebes or Sparta to stop the war. Kagan criticizes the Periclean strategy on four counts: first that by rejecting minor concessions it brought about war; second, that it was unforeseen by the enemy and hence lacked credibility; third, that it was too feeble to exploit any opportunities; and fourth, that it depended on Pericles for its execution and thus was bound to be abandoned after his death. Kagan estimates Pericles' expenditure on his military strategy in the Peloponnesian War to be about 2,000 talents annually, and based on this figure concludes that he would have only enough money to keep the war going for three years. He asserts that since Pericles must have known about these limitations he probably planned for a much shorter war. Others, such as Donald W. Knight, conclude that the strategy was too defensive and would not succeed.