[Alan Sullivan]

The first letter of a stressed syllable alliterates. Identical sound on any letter other than the first is assonance, not alliteration.

Your example, therefore, is xxxx, an effect to avoid, except in light verse or parody.

Here is a proper line, suggested by events.

the terrible toll of titanic bombs

The address is http://www.jps.net/pdeane/fgr/